Programming a Multiplayer FPS in DirectX/Programming a Multiplayer FPS in DirectX (Companion CD).iso/Source/Chapter 13/Game/PlayerObject.cpp

C/C++ Source or Header | 2004-10-01 | 25.3 KB | 762 lines

//-----------------------------------------------------------------------------
// PlayerObject.h implementation.
// Refer to the PlayerObject.h interface for more details.
//
// Programming a Multiplayer First Person Shooter in DirectX
// Copyright (c) 2004 Vaughan Young
//-----------------------------------------------------------------------------
#include "Main.h"

//-----------------------------------------------------------------------------
// The player object class constructor.
//-----------------------------------------------------------------------------
PlayerObject::PlayerObject( PlayerInfo *player, Script *script, unsigned long type ) : AnimatedObject( script->GetStringData( "mesh_name" ), script->GetStringData( "mesh_path" ), type )
{
    // Set the player's DirectPlay ID.
    m_dpnid = player->dpnid;

    // Set the players's name.
    m_name = new char[strlen( player->name ) + 1];
    strcpy( m_name, player->name );

    // Players start with full health;
    m_health = 100.0f;
    m_dying = false;

    // Indicate that the view transform is not being taken from this player.
    m_isViewing = false;

    // Clear the player's score.
    m_frags = 0;
    m_deaths = 0;

    // Player objects start off invisible and disabled.
    SetVisible( false );
    SetEnabled( false );

    // Clear the player's input.
    m_drive = 0.0f;
    m_strafe = 0.0f;
    m_fire = false;

    // Set the correct ellipse radius.
    SetEllipsoidRadius( *script->GetVectorData( "ellipse_radius" ) );

    // Level the player's view tilt.
    m_viewTilt = 0.0f;

    // Set the default view smoothing and sensitivity.
    m_viewSmoothing = 0.5f;
    m_viewSensitivity = 0.5f;

    // Get the view weapon offset.
    m_viewWeaponOffset = *script->GetVectorData( "view_weapon_offset" );

    // Clear the weapons array.
    for( unsigned char w = 0; w < 10; w++ )
        m_weapons[w] = NULL;

    // The player starts with the first basic weapon.
    Script *weaponScript = new Script( "Gun1.txt", "./Assets/Objects/Gun1/" );
    m_weapons[0] = new Weapon( weaponScript, m_viewWeaponOffset );
    m_currentWeapon = 0;
    if( player->dpnid == g_engine->GetNetwork()->GetLocalID() )
        m_weapons[m_currentWeapon]->UseViewWeapon( true );
    else
        m_weapons[m_currentWeapon]->UseViewWeapon( false );
    SAFE_DELETE( weaponScript );

    // Indicate that the player is not changing weapons.
    m_changingWeapon = 0.0f;
    m_weaponChanging = false;

    // Create the callback data used for tracking the player's foot steps.
    m_callbackData[0].foot = 0;
    m_callbackData[1].foot = 1;

    // Create the callback keys. The second key time is set per animation.
    D3DXKEY_CALLBACK keys[2];
    keys[0].Time = 0;
    keys[0].pCallbackData = &m_callbackData[0];
    keys[1].pCallbackData = &m_callbackData[1];

    LPD3DXKEYFRAMEDANIMATIONSET oldAS;
    LPD3DXCOMPRESSEDANIMATIONSET newAS;
    LPD3DXBUFFER buffer;

    // Go through the four movement animations and set the foot step keys.
    for( char a = 1; a < 5; a++ )
    {
        // Get the old animation.
        GetAnimationController()->GetAnimationSet( a, (LPD3DXANIMATIONSET*)&oldAS );

        // Set the time for the second key.
        keys[1].Time = float( oldAS->GetPeriod() / 2.0f * oldAS->GetSourceTicksPerSecond() );

        // Compress the old animation set.
        oldAS->Compress( D3DXCOMPRESS_DEFAULT, 0.4f, NULL, &buffer );

        // Create the new animation using the old one and the foot step keys.
        D3DXCreateCompressedAnimationSet( oldAS->GetName(), oldAS->GetSourceTicksPerSecond(), oldAS->GetPlaybackType(), buffer, 2, keys, &newAS );
        SAFE_RELEASE( buffer );

        // Unregister the old animation set.
        GetAnimationController()->UnregisterAnimationSet( oldAS );
        SAFE_RELEASE( oldAS );

        // Register the new animation set.
        // Note: The new animation is appended to the end of the list.
        GetAnimationController()->RegisterAnimationSet( newAS );
        SAFE_RELEASE( newAS );
    }

    // Play the idle animation.
    PlayAnimation( 0, 0.0f );

    // Create the step sound audio paths.
    m_leftStepAudioPath = new AudioPath3D;
    m_rightStepAudioPath = new AudioPath3D;

    // Set the friction on this object.
    SetFriction( 8.0f );
}

//-----------------------------------------------------------------------------
// The player object class destructor.
//-----------------------------------------------------------------------------
PlayerObject::~PlayerObject()
{
    // Destroy the weapons array.
    for( unsigned char w = 0; w < 10; w++ )
        SAFE_DELETE( m_weapons[w] );

    // Destroy the string buffer containing the player's name.
    SAFE_DELETE( m_name );
}

//-----------------------------------------------------------------------------
// Updates the player object.
//-----------------------------------------------------------------------------
void PlayerObject::Update( float elapsed, bool addVelocity )
{
    // Allow the base animated object to update.
    AnimatedObject::Update( elapsed, addVelocity );

    // Override the object's forward vector to take the view tilt into account.
    // This will allow the forward vector to move up and down as well instead
    // of just remaining horizontal. This is not important for movement since
    // the player can not fly, but for things like shooting it is.
    m_forward.x = (float)sin( GetRotation().y );
    m_forward.y = (float)-tan( m_viewTilt );
    m_forward.z = (float)cos( GetRotation().y );
    D3DXVec3Normalize( &m_forward, &m_forward );

    // Set the player's view point. This is done every frame because as the
    // mesh is animated, the reference point in the mesh may move. This
    // will allow the view point to move with the mesh's animations.
    m_viewPoint = GetMesh()->GetReferencePoint( "rp_view_point" )->GetTranslation();

    // Ensure that the view movement is relative to the rotation.
    D3DXVec3TransformCoord( &m_viewPoint, &m_viewPoint, GetRotationMatrix() );

    // Only calculate the correct view matrix if it is being used.
    if( m_isViewing == true )
    {
        // Create the x axis rotation matrix.
        D3DXMATRIX rotationXMatrix;
        D3DXMatrixRotationX( &rotationXMatrix, m_viewTilt );

        // Create the combined rotation matrix (i.e. y axis rotation from the
        // scene object plus the x axis rotation from the player object).
        D3DXMATRIX combinedRotation;
        D3DXMatrixMultiply( &combinedRotation, &rotationXMatrix, GetRotationMatrix() );

        // Build a translation matrix that represents the final view point.
        D3DXMATRIX viewPointTranslationMatrix;
        D3DXVECTOR3 finalViewPointTranslation = GetTranslation() + m_viewPoint;
        D3DXMatrixTranslation( &viewPointTranslationMatrix, finalViewPointTranslation.x, finalViewPointTranslation.y, finalViewPointTranslation.z );

        // Override the object's view matrix using the combined rotation and
        // the position of the final view point translation.
        D3DXMatrixMultiply( &m_viewMatrix, &combinedRotation, &viewPointTranslationMatrix );
        D3DXMatrixInverse( &m_viewMatrix, NULL, &m_viewMatrix );
    }

    // Ignore the rest if the player is dying (or dead)
    if( m_dying == true )
        return;

    // Drive and strafe the player accordingly.
    if( m_drive != 0.0f )
        Drive( m_drive * 8000.0f * elapsed );
    if( m_strafe != 0.0f )
        Strafe( m_strafe * 4000.0f * elapsed );

    // Update the step audio paths.
    m_leftStepAudioPath->SetPosition( GetTranslation() + GetMesh()->GetReferencePoint( "rp_left_foot" )->GetTranslation() );
    m_leftStepAudioPath->SetVelocity( GetVelocity() );
    m_rightStepAudioPath->SetPosition( GetTranslation() + GetMesh()->GetReferencePoint( "rp_right_foot" )->GetTranslation() );
    m_rightStepAudioPath->SetVelocity( GetVelocity() );

    // Check if the player is changing their weapon (local player only).
    static float move = 0.0f;
    if( m_changingWeapon > 0.0f )
    {
        m_changingWeapon -= elapsed;

        if( m_changingWeapon > 1.0f )
        {
            // Lower the old weapon.
            move -= 100.0f * elapsed;
            m_weapons[m_oldWeapon]->RaiseLowerWeapon( elapsed, this, move );
        }
        else if( m_changingWeapon < 0.0f )
        {
            // The new weapon is in place.
            m_changingWeapon = 0.0f;
            move = 0.0f;

            // Send a message to inform the other players the weapon is ready.
            PlayerWeaponChangeMsg pwcm;
            pwcm.msgid = MSGID_PLAYER_WEAPON_CHANGE;
            pwcm.dpnid = g_engine->GetNetwork()->GetLocalID();
            pwcm.weapon = m_currentWeapon;
            g_engine->GetNetwork()->Send( &pwcm, sizeof( PlayerWeaponChangeMsg ), DPNID_ALL_PLAYERS_GROUP, DPNSEND_NOLOOPBACK );
        }
        else
        {
            // Raise the new weapon.
            move += 100.0f * elapsed;
            m_weapons[m_currentWeapon]->RaiseLowerWeapon( elapsed, this, move );
        }
    }
    else
    {
        // Update the player's current weapon, when not changing weapons.
        if( m_weaponChanging == false )
            m_weapons[m_currentWeapon]->Update( elapsed, m_fire, this, m_viewPoint.y );
    }
}

//-----------------------------------------------------------------------------
// Renders the player object.
//-----------------------------------------------------------------------------
void PlayerObject::Render( D3DXMATRIX *world )
{
    // Allow the base animated object to render.
    if( m_dpnid != g_engine->GetNetwork()->GetLocalID() )
        AnimatedObject::Render( world );
    else if( m_dying == true )
        return;

    // Render the player's weapon.
    if( m_weaponChanging == false )
    {
        if( m_changingWeapon > 1.0f )
            m_weapons[m_oldWeapon]->Render( this );
        else
            m_weapons[m_currentWeapon]->Render( this );
    }
}

//-----------------------------------------------------------------------------
// Called when something collides with the object.
//-----------------------------------------------------------------------------
void PlayerObject::CollisionOccurred( SceneObject *object, unsigned long collisionStamp )
{
    // Ignore collisions if the player is dying (or dead)
    if( m_dying == true )
        return;

    // Allow the base scene object to register the collision.
    SceneObject::CollisionOccurred( object, collisionStamp );

    // Check if the player has hit a spawner object.
    if( object->GetType() != TYPE_SPAWNER_OBJECT )
        return;

    // Get a pointer to the spawner object.
    SpawnerObject *spawner = (SpawnerObject*)object;

    // Check if the player has picked up a weapon.
    if( *spawner->GetObjectScript()->GetNumberData( "type" ) == WEAPON_SPAWN_OBJECT )
    {
        // Get the list position of the weapon.
        char listPosition = (char)*spawner->GetObjectScript()->GetNumberData( "list_position" );

        // Ensure the player doesn't already have a weapon in this slot.
        if( m_weapons[listPosition] == NULL )
        {
            // Load the new weapon in.
            m_weapons[listPosition] = new Weapon( spawner->GetObjectScript(), m_viewWeaponOffset );

            // Check if this is the local player.
            if( m_dpnid == g_engine->GetNetwork()->GetLocalID() )
            {
                // Set the weapon to use the first person mesh.
                m_weapons[listPosition]->UseViewWeapon( true );

                // Change to this weapon.
                ChangeWeapon( 0, listPosition );
            }
            else
            {
                // Set the weapon to use the first person mesh.
                m_weapons[listPosition]->UseViewWeapon( false );
            }
        }
        else if( m_weapons[listPosition]->GetValid() == false )
        {
            // Validate the weapon.
            m_weapons[listPosition]->SetValid( true );

            // Change to this weapon.
            ChangeWeapon( 0, listPosition );
        }
    }
}

//-----------------------------------------------------------------------------
// Rotates the player's view.
//-----------------------------------------------------------------------------
void PlayerObject::MouseLook( float x, float y, bool reset )
{
    static float lastX = 0.0f;
    static float lastY = 0.0f;

    // Check if the player's view needs to be reset.
    if( reset == true )
    {
        lastX = lastY = 0.0f;
        SetRotation( 0.0f, 0.0f, 0.0f );
        m_viewTilt = 0.0f;
        return;
    }

    // Calculate the real x and y values by accounting for smoothing.
    lastX = lastX * m_viewSmoothing + x * ( 1.0f - m_viewSmoothing );
    lastY = lastY * m_viewSmoothing + y * ( 1.0f - m_viewSmoothing );

    // Adjust the values for sensitivity.
    lastX *= m_viewSensitivity;
    lastY *= m_viewSensitivity;

    // Rotate the scene object around the y axis only. This will prevent the
    // player's mesh from rotating when the player looks up and down.
    AddRotation( 0.0f, lastY, 0.0f );

    // Ensure the view will not rotate to far up or down.
    if( ( m_viewTilt > 0.8f && lastX > 0.0f ) || ( m_viewTilt < -0.8f && lastX < 0.0f ) )
        lastX = 0.0f;

    // Maintain a seperate view rotation around the x axis to allow the player
    // to look up and down.
    m_viewTilt += lastX;
}

//-----------------------------------------------------------------------------
// Hurts the player with the given damage.
//-----------------------------------------------------------------------------
void PlayerObject::Hurt( float damage, PlayerObject *attacker )
{
    // Ignore dying (or dead) players.
    if( m_dying == true )
        return;

    // Adjust the player's health.
    m_health -= damage;

    // Send a player health update message.
    PlayerHealthMsg phm;
    phm.msgid = MSGID_PLAYER_HEALTH;
    phm.dpnid = m_dpnid;
    phm.health = m_health;
    g_engine->GetNetwork()->Send( &phm, sizeof( PlayerHealthMsg ), DPNID_ALL_PLAYERS_GROUP, DPNSEND_NOLOOPBACK );

    // Check if the player is still alive (i.e. health above zero).
    if( m_health > 0.0f )
        return;

    // The player has been killed.
    Kill();

    // Increment the player's death tally.
    m_deaths += 1;

    // Send a player score update message for the fragged player.
    PlayerScoreMsg psm1;
    psm1.msgid = MSGID_PLAYER_SCORE;
    psm1.dpnid = m_dpnid;
    psm1.frags = m_frags;
    psm1.deaths = m_deaths;
    g_engine->GetNetwork()->Send( &psm1, sizeof( PlayerScoreMsg ), DPNID_ALL_PLAYERS_GROUP, DPNSEND_NOLOOPBACK );

    // Increment the attacking player's frag tally.
    attacker->SetFrags( attacker->GetFrags() + 1 );

    // Send a player score update message for the bullet owner.
    PlayerScoreMsg psm2;
    psm2.msgid = MSGID_PLAYER_SCORE;
    psm2.dpnid = attacker->GetID();
    psm2.frags = attacker->GetFrags();
    psm2.deaths = attacker->GetDeaths();
    g_engine->GetNetwork()->Send( &psm2, sizeof( PlayerScoreMsg ), DPNID_ALL_PLAYERS_GROUP, DPNSEND_NOLOOPBACK );
}

//-----------------------------------------------------------------------------
// Kills the player.
//-----------------------------------------------------------------------------
void PlayerObject::Kill()
{
    // Indicate that the player is dying.
    m_dying = true;

    // Clear the player's movment.
    SetDrive( 0.0f );
    SetStrafe( 0.0f );
    SetFire( false );
    Stop();

    // Clear the player's weapons.
    ClearWeapons();

    // Stop the player from changing weapons.
    m_changingWeapon = 0.0f;
    m_weaponChanging = false;

    // Play the death animation.
    PlayAnimation( ANIM_DEATH, 0.0f, false );
}

//-----------------------------------------------------------------------------
// Returns the player object's DirectPlay ID number.
//-----------------------------------------------------------------------------
DPNID PlayerObject::GetID()
{
    return m_dpnid;
}

//-----------------------------------------------------------------------------
// Returns the player object's name.
//-----------------------------------------------------------------------------
char *PlayerObject::GetName()
{
    return m_name;
}

//-----------------------------------------------------------------------------
// Sets the player object's health.
//-----------------------------------------------------------------------------
void PlayerObject::SetHealth( float health )
{
    m_health = health;
}

//-----------------------------------------------------------------------------
// Returns the player object's health.
//-----------------------------------------------------------------------------
float PlayerObject::GetHealth()
{
    return m_health;
}

//-----------------------------------------------------------------------------
// Sets the player object's dying flag.
//-----------------------------------------------------------------------------
void PlayerObject::SetDying( bool dying )
{
    m_dying = dying;
}

//-----------------------------------------------------------------------------
// Returns the player object's dying flag.
//-----------------------------------------------------------------------------
bool PlayerObject::GetDying()
{
    return m_dying;
}

//-----------------------------------------------------------------------------
// Sets the player object's viewing flag.
//-----------------------------------------------------------------------------
void PlayerObject::SetIsViewing( bool isViewing )
{
    m_isViewing = isViewing;
}

//-----------------------------------------------------------------------------
// Sets the player object's frag count.
//-----------------------------------------------------------------------------
void PlayerObject::SetFrags( unsigned long frags )
{
    m_frags = frags;
}

//-----------------------------------------------------------------------------
// Returns the player object's frag count.
//-----------------------------------------------------------------------------
unsigned long PlayerObject::GetFrags()
{
    return m_frags;
}

//-----------------------------------------------------------------------------
// Sets the player object's death count.
//-----------------------------------------------------------------------------
void PlayerObject::SetDeaths( unsigned long deaths )
{
    m_deaths = deaths;
}

//-----------------------------------------------------------------------------
// Returns the player object's death count.
//-----------------------------------------------------------------------------
unsigned long PlayerObject::GetDeaths()
{
    return m_deaths;
}

//-----------------------------------------------------------------------------
// Sets the player object's drive.
//-----------------------------------------------------------------------------
void PlayerObject::SetDrive( float drive )
{
    // Ignore if the player is dying (or dead)
    if( m_dying == true )
        return;

    if( drive == 0.0f )
    {
        if( m_drive != 0.0f && m_strafe == 0.0f )
            PlayAnimation( ANIM_IDLE, 0.2f );
    }
    else if( m_drive == 0.0f && m_strafe == 0.0f )
    {
        if( drive == 1.0f )
            PlayAnimation( ANIM_FORWARDS, 0.2f );
        else
            PlayAnimation( ANIM_BACKWARDS, 0.2f );
    }

    m_drive = drive;
}

//-----------------------------------------------------------------------------
// Returns the player object's current drive.
//-----------------------------------------------------------------------------
float PlayerObject::GetDrive()
{
    return m_drive;
}

//-----------------------------------------------------------------------------
// Sets the player object's strafe.
//-----------------------------------------------------------------------------
void PlayerObject::SetStrafe( float strafe )
{
    // Ignore if the player is dying (or dead)
    if( m_dying == true )
        return;

    if( strafe == 0.0f )
    {
        if( m_strafe != 0.0f && m_drive == 0.0f )
            PlayAnimation( ANIM_IDLE, 0.2f );
    }
    else if( m_strafe == 0.0f && m_drive == 0.0f )
    {
        if( strafe == 1.0f )
            PlayAnimation( ANIM_RIGHT, 0.2f );
        else
            PlayAnimation( ANIM_LEFT, 0.2f );
    }

    m_strafe = strafe;
}

//-----------------------------------------------------------------------------
// Returns the player object's current strafe.
//-----------------------------------------------------------------------------
float PlayerObject::GetStrafe()
{
    return m_strafe;
}

//-----------------------------------------------------------------------------
// Sets the player object's fire flag.
//-----------------------------------------------------------------------------
void PlayerObject::SetFire( bool fire )
{
    // Ignore if the player is dying (or dead)
    if( m_dying == true )
        return;

    m_fire = fire;
}

//-----------------------------------------------------------------------------
// Returns the player object's fire flag.
//-----------------------------------------------------------------------------
bool PlayerObject::GetFire()
{
    return m_fire;
}

//-----------------------------------------------------------------------------
// Changes weapon in either the given direction or to the given weapon.
//-----------------------------------------------------------------------------
void PlayerObject::ChangeWeapon( char change, char weapon )
{
    // Ignore if the player is dying (or dead)
    if( m_dying == true )
        return;

    // If the player is already changing weapons, then ingore this request.
    if( m_changingWeapon > 0.0f )
        return;

    // Store the player's current weapon.
    m_oldWeapon = m_currentWeapon;

    // Check if the player is changing to a specific weapon.
    if( change == 0 )
    {
        // Change to the weapon and ensure it is valid.
        m_currentWeapon = weapon;
        if( m_weapons[m_currentWeapon] == NULL )
            m_currentWeapon = m_oldWeapon;
        else if( m_weapons[m_currentWeapon]->GetValid() == false )
            m_currentWeapon = m_oldWeapon;
    }
    else
    {
        // Loop through the weapons until the next valid weapon is found.
        do
        {
            do
            {
                m_currentWeapon += change;

                if( m_currentWeapon < 0 )
                    m_currentWeapon = 9;
                else if( m_currentWeapon > 9 )
                    m_currentWeapon = 0;
            }
            while( m_weapons[m_currentWeapon] == NULL );
        }
        while( m_weapons[m_currentWeapon]->GetValid() == false );
    }

    // Ensure the player actually changed to a different weapon.
    if( m_oldWeapon == m_currentWeapon )
        return;

    // Begin the weapon change process.
    m_changingWeapon = 2.0f;

    // Send a weapon changing message.
    NetworkMessage pwcm;
    pwcm.msgid = MSGID_PLAYER_WEAPON_CHANGING;
    pwcm.dpnid = g_engine->GetNetwork()->GetLocalID();
    g_engine->GetNetwork()->Send( &pwcm, sizeof( NetworkMessage ), DPNID_ALL_PLAYERS_GROUP, DPNSEND_NOLOOPBACK );
}

//-----------------------------------------------------------------------------
// Indicates that this player is currently changing weapons.
//-----------------------------------------------------------------------------
void PlayerObject::WeaponChanging()
{
    m_weaponChanging = true;
}

//-----------------------------------------------------------------------------
// Indicates that this player has changed weapons to the given weapon.
//-----------------------------------------------------------------------------
void PlayerObject::WeaponChanged( char weapon )
{
    m_currentWeapon = weapon;
    m_weaponChanging = false;
}

//-----------------------------------------------------------------------------
// Clears all the player object's weapons, except the first one.
//-----------------------------------------------------------------------------
void PlayerObject::ClearWeapons()
{
    // Invalidate all but the player's first weapon.
    for( unsigned char w = 1; w < 10; w++ )
        if( m_weapons[w] != NULL )
            m_weapons[w]->SetValid( false );

    // Set the current weapon and weapon changing flags.
    m_currentWeapon = 0;
    m_changingWeapon = 0.0f;
    m_weaponChanging = false;
}

//-----------------------------------------------------------------------------
// Sets the player object's view tilt (i.e. the rotation around the x axis).
//-----------------------------------------------------------------------------
void PlayerObject::SetViewTilt( float tilt )
{
    m_viewTilt = tilt;
}

//-----------------------------------------------------------------------------
// Returns the player object's view tilt (i.e. the rotation around the x axis).
//-----------------------------------------------------------------------------
float PlayerObject::GetViewTilt()
{
    return m_viewTilt;
}

//-----------------------------------------------------------------------------
// Returns the player object's eye point.
//-----------------------------------------------------------------------------
D3DXVECTOR3 PlayerObject::GetEyePoint()
{
    return GetTranslation() + m_viewPoint;
}

//-----------------------------------------------------------------------------
// Animation call back handler.
//-----------------------------------------------------------------------------
HRESULT CALLBACK PlayerObject::HandleCallback( THIS_ UINT Track, LPVOID pCallbackData )
{
    // Get a pointer to the callback data.
    AnimationCallbackData *data = (AnimationCallbackData*)pCallbackData;

    // If the player is not touching the ground, then it can't make foot steps.
    if( IsTouchingGround() == false )
        return S_OK;

    // Check which foot caused the callback.
    if( data->foot == 1 )
    {
        // Reset the step result.
        m_stepResult.material = NULL;

        // Preform a ray intersection for the left foot. If it is succesful,
        // then play the material's step sound.
        if( g_engine->GetSceneManager()->RayIntersectScene( &m_stepResult, GetTranslation() + GetMesh()->GetReferencePoint( "rp_left_foot" )->GetTranslation(), D3DXVECTOR3( 0.0f, -1.0f, 0.0f ) ) == true )
        {
            if( ( (GameMaterial*)m_stepResult.material )->GetStepSound() != NULL )
                m_leftStepAudioPath->Play( ( (GameMaterial*)m_stepResult.material )->GetStepSound()->GetSegment() );
        }
    }
    else
    {
        // Reset the step result.
        m_stepResult.material = NULL;

        // Preform a ray intersection for the right foot. If it is succesful,
        // then play the material's step sound.
        if( g_engine->GetSceneManager()->RayIntersectScene( &m_stepResult, GetTranslation() + GetMesh()->GetReferencePoint( "rp_right_foot" )->GetTranslation(), D3DXVECTOR3( 0.0f, -1.0f, 0.0f ) ) == true )
        {
            if( ( (GameMaterial*)m_stepResult.material )->GetStepSound() != NULL )
                m_rightStepAudioPath->Play( ( (GameMaterial*)m_stepResult.material )->GetStepSound()->GetSegment() );
        }
    }

    return S_OK;
}