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3d2-dkb.c
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1991-05-16
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877 lines
/*-------------------------------------------------------------------------
3D2 to DKB File Converter
Copyright 1991 by Steve Anger
This file may be freely modified and distributed so long as the original
copyright notice is included.
V1.2 05/09/91 Minor MSC compatibility modifications made by Aaron A. Collins
--------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifdef __TURBOC__
#include <alloc.h>
#include <conio.h>
#include <graphics.h>
#endif
const char Ver[] = "v1.2";
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
typedef struct
{
float x, y, z;
} Vector;
typedef struct
{
float Red;
float Green;
float Blue;
} Palette;
typedef struct
{
int VertA; /* Vertex A of the triangle */
int VertB; /* " B " " " */
int VertC; /* " C " " " */
int Colour; /* Colour of triangle */
int EdgeFlag; /* Which edges are to be drawn (not used) */
} Triangle;
typedef struct TriNode
{
int TriNo;
struct TriNode *Next;
} TriangleNode;
typedef unsigned char byte;
typedef signed int word;
typedef int boolean;
const int true = 1;
const int false = 0;
/* Function prototype definitions */
void Read3D2Header(void);
void Read3D2Object(void);
void WriteDKBHeader(void);
void WriteDKBObject(void);
void WriteDKBSummary(void);
void ProcessArgs (int argc, char *argv[]);
void PrintVector (FILE *g, Vector *V);
void AddExt (char *FileName, char *Ext, boolean Force);
byte ReadByte(FILE *f);
word ReadWord(FILE *f);
void Abort (char* Msg, int ExitCode);
void MinVector (Vector *V1, Vector *V2);
void MaxVector (Vector *V1, Vector *V2);
void VertNormal (Triangle *T, Vector *NormA, Vector *NormB, Vector *NormC);
void BuildTriIndex (void);
void DumpTriIndex (void);
void TriNormal (Triangle *T, Vector *Normal);
void InitDisplay(void);
void PlotTriangle (Triangle *Tri);
void CloseDisplay(void);
void VectAdd (Vector *V1, Vector *V2, Vector *V3);
void VectSub (Vector *V1, Vector *V2, Vector *V3);
void VectScale (Vector *V1, float k);
float VectMag (Vector *V);
float DotProd (Vector *V1, Vector *V2);
void CrossProd (Vector *V1, Vector *V2, Vector *V3);
void VectCopy (Vector *V1, Vector *V2);
void VectInit (Vector *V, float x, float y, float z);
float VectAngle (Vector *V1, Vector *V2);
/* Global variables */
FILE *f; /* Input file */
FILE *g; /* Output file */
char InFile[64]; /* Input file name */
char OutFile[64]; /* Output file name */
boolean Display; /* Screen preview flag */
Vector LookAt; /* Location to look at */
Vector ViewPoint; /* Location of viewpoint */
Vector Nx, Ny, Nz; /* Co-ord system for rotated space */
float Smooth; /* Smooth triangles who's normals differ by */
/* less than this angle (degrees) */
/* 3D2 Header infomation */
int ObjCount; /* Number of objects contained in file */
int LightOn[3]; /* 1 = Light source is on, 0 = off */
float LightBright[3]; /* Light source brightness */
Vector LightPos[3]; /* Light source position */
float Ambient; /* Ambient light brightness */
Palette Pal[16]; /* Colour palette for objects */
int GBase[16]; /* Colour group base array (not used) */
int PalType; /* Colour palette type (not used) */
int WColour; /* Wireframe colour (not used) */
int OColour; /* Outline colour (not used) */
/* 3D2 Object information */
char ObjName[9]; /* Name of current object */
int VertCount; /* Number of verticies in object */
Vector *Vert; /* Pointer to array of verticies */
int TriCount; /* Number of triangular faces in object */
Triangle *Tri; /* Pointer to array of triangles */
int DegenTri; /* Degenerate triangles */
Vector ObjMin, ObjMax;
TriangleNode **TriList; /* List of triangles touching each vertex */
int main (int argc, char* argv[])
{
int i;
int Verticies[40], Triangles[40], Degens[40];
char Names[40][9];
int TotalTri, TotalVert, TotalDegen;
ProcessArgs (argc, argv);
if (Display)
InitDisplay();
Read3D2Header(); /* Read 3D2 file header */
WriteDKBHeader(); /* Write DKB file header info */
for (i = 0; i < ObjCount; i++) {
Read3D2Object(); /* Read an object from 3D2 file */
WriteDKBObject(); /* Write object to DKB file */
strcpy (Names[i], ObjName); /* Keep a list of the object names, */
Verticies[i] = VertCount; /* vertex counts, etc. */
Triangles[i] = TriCount;
Degens[i] = DegenTri;
}
WriteDKBSummary();
fclose(f);
fclose(g);
if (Display)
CloseDisplay();
/* Print summary of objects converted */
printf ("\nConverted %d object(s), ", ObjCount);
printf ("%d light source(s).\n\n", LightOn[0] + LightOn[1] + LightOn[2]);
printf (" Object Verticies Triangles Degen Tri \n");
printf ("---------- ----------- ----------- -----------\n");
TotalVert = 0;
TotalTri = 0;
TotalDegen = 0;
for (i = 0; i < ObjCount; i++) {
printf (" %-8s %6d %6d %6d\n",
Names[i], Verticies[i], Triangles[i], Degens[i]);
TotalVert += Verticies[i];
TotalTri += Triangles[i];
TotalDegen += Degens[i];
}
printf (" =========== =========== ===========\n");
printf (" Total %6d %6d %6d\n", TotalVert, TotalTri, TotalDegen);
return 0;
}
void ProcessArgs (int argc, char *argv[])
{
int i;
printf (" 3D2 to DKB Data File Converter %s\n", Ver);
printf (" Copyright 1991 Steve Anger\n\n");
if (argc < 2) {
printf ("Usage: 3d2-dkb inputfile [outputfile] [[-/]options]\n\n");
printf ("Options: -d - Preview object on screen.\n");
printf (" -lxnnn - Set LOOK_AT x coord to nnn\n");
printf (" -lynnn - ' ' y ' ' ' \n");
printf (" -lznnn - ' ' z ' ' ' \n");
printf (" -vxnnn - Set VIEW_POINT x coord to nnn\n");
printf (" -vynnn - ' ' y ' ' ' \n");
printf (" -vznnn - ' ' z ' ' ' \n");
printf (" -snnn - Smooth triangle boundaries with angles < nnn\n");
exit(1);
}
InFile[0] = '\0';
OutFile[0] = '\0';
Display = false;
VectInit (&LookAt, 0.0, 0.0, 0.0);
VectInit (&ViewPoint, 50.0, 50.0, -50.0);
Smooth = 0.0;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-' || argv[i][0] == '/') {
switch (argv[i][1]) {
case 'd': Display = true;
break;
case 's': sscanf (&argv[i][2], "%f", &Smooth);
break;
case 'l': switch (argv[i][2]) {
case 'x': sscanf (&argv[i][3], "%f", &LookAt.x);
break;
case 'y': sscanf (&argv[i][3], "%f", &LookAt.y);
break;
case 'z': sscanf (&argv[i][3], "%f", &LookAt.z);
}
break;
case 'v': switch (argv[i][2]) {
case 'x': sscanf (&argv[i][3], "%f", &ViewPoint.x);
break;
case 'y': sscanf (&argv[i][3], "%f", &ViewPoint.y);
break;
case 'z': sscanf (&argv[i][3], "%f", &ViewPoint.z);
}
}
}
else if (InFile[0] == '\0') {
strcpy (InFile, argv[i]);
AddExt (InFile, "3D2", false);
}
else if (OutFile[0] == '\0') {
strcpy (OutFile, argv[i]);
AddExt (OutFile, "DAT", false);
}
else
Abort ("Too many file names.", 1);
}
/* Prevent a division by zero error later on */
if ((ViewPoint.x - LookAt.x) == 0.0 && (ViewPoint.z - LookAt.z) == 0.0)
ViewPoint.z -= 0.01;
if (OutFile[0] == '\0') {
strcpy (OutFile, InFile);
AddExt (OutFile, "DAT", true);
}
f = fopen (InFile, "rb");
if (f == NULL)
Abort ("Error opening input file.", 2);
g = fopen (OutFile, "w");
if (g == NULL)
Abort ("Error opening output file.", 2);
}
void AddExt (char *FileName, char *Ext, boolean Force)
{
int i;
for (i = 0; i < strlen(FileName); i++)
if (FileName[i] == '.') break;
if (FileName[i] == '\0' || Force) {
FileName[i] = '.';
strcpy (&FileName[i+1], Ext);
}
}
byte ReadByte(FILE *f)
{
return fgetc(f);
}
word ReadWord(FILE *f)
{
byte bh, bl;
bh = fgetc(f); /* Read a Motorola format word */
bl = fgetc(f);
return (256*bh + bl);
}
void Abort (char *Msg, int ExitCode)
{
if (Display)
CloseDisplay();
puts (Msg);
exit (ExitCode);
}
void PrintVector (FILE *g, Vector *V)
{
fprintf (g, "<%.2f %.2f %.2f> ", V->x, V->y, V->z);
}
void MinVector (Vector *V1, Vector *V2)
{
V1->x = (V1->x < V2->x) ? V1->x : V2->x;
V1->y = (V1->y < V2->y) ? V1->y : V2->y;
V1->z = (V1->z < V2->z) ? V1->z : V2->z;
}
void MaxVector (Vector *V1, Vector *V2)
{
V1->x = (V1->x > V2->x) ? V1->x : V2->x;
V1->y = (V1->y > V2->y) ? V1->y : V2->y;
V1->z = (V1->z > V2->z) ? V1->z : V2->z;
}
int Degenerate (Triangle *Tri)
{
Vector a, b, c;
Vector ab, bc, Temp;
VectCopy (&a, &Vert[Tri->VertA]);
VectCopy (&b, &Vert[Tri->VertB]);
VectCopy (&c, &Vert[Tri->VertC]);
VectSub (&ab, &a, &b);
VectSub (&bc, &b, &c);
CrossProd (&Temp, &ab, &bc);
return (VectMag(&Temp) == 0.0);
}
void Read3D2Header()
{
int i;
word Temp;
if (ReadWord(f) != 0x3D02)
Abort ("Input file is not 3D2 format.", 3);
ObjCount = ReadWord(f);
LightOn[0] = ReadWord(f);
LightOn[1] = ReadWord(f);
LightOn[2] = ReadWord(f);
LightBright[0] = ReadWord(f)/7.0;
LightBright[1] = ReadWord(f)/7.0;
LightBright[2] = ReadWord(f)/7.0;
Ambient = ReadWord(f)/7.0;
LightPos[0].y = (float)ReadWord(f);
LightPos[1].y = (float)ReadWord(f);
LightPos[2].y = (float)ReadWord(f);
LightPos[0].z = (float)ReadWord(f);
LightPos[1].z = (float)ReadWord(f);
LightPos[2].z = (float)ReadWord(f);
LightPos[0].x = (float)ReadWord(f);
LightPos[1].x = (float)ReadWord(f);
LightPos[2].x = (float)ReadWord(f);
for (i = 0; i < 16; i++) {
Temp = ReadWord(f);
Pal[i].Red = ((Temp & 0x0700) >> 8)/7.0;
Pal[i].Green = ((Temp & 0x0070) >> 4)/7.0;
Pal[i].Blue = (Temp & 0x0007)/7.0;
}
for (i = 0; i < 16; i++)
GBase[i] = ReadWord(f);
PalType = ReadWord(f);
WColour = ReadWord(f);
OColour = ReadWord(f);
for (i = 0; i < 150; i++)
ReadByte(f);
}
void Read3D2Object()
{
int i;
for (i = 0; i < 9; i++)
ObjName[i] = ReadByte(f);
VertCount = ReadWord(f);
Vert = malloc (VertCount * sizeof(*Vert));
if (Vert == NULL)
Abort ("Insufficient memory for verticies.", 4);
for (i = 0; i < VertCount; i++) {
Vert[i].x = ReadWord(f)/100.0;
Vert[i].z = ReadWord(f)/100.0;
Vert[i].y = ReadWord(f)/100.0;
}
TriCount = ReadWord(f);
Tri = malloc (TriCount * sizeof(*Tri));
if (Tri == NULL)
Abort ("Insufficient memory for triangles.", 4);
for (i = 0; i < TriCount; i++) {
Tri[i].VertA = ReadWord(f);
Tri[i].VertB = ReadWord(f);
Tri[i].VertC = ReadWord(f);
Tri[i].EdgeFlag = ReadByte(f);
Tri[i].Colour = ReadByte(f);
}
}
void WriteDKBHeader()
{
fprintf (g, "{ Converted from file %s with 3D2-DKB %s }\n\n", InFile, Ver);
fprintf (g, "DECLARE DefaultTexture = TEXTURE\n");
fprintf (g, " AMBIENT %.3f\n", Ambient);
fprintf (g, " DIFFUSE 0.7\n");
fprintf (g, "END_TEXTURE\n\n");
fprintf (g, "COMPOSITE\n");
}
void BuildTriIndex()
{
int Vert, i;
TriangleNode *Temp;
/* Build a table containing a list of the triangles that use */
/* each vertex (ie. TriList[n] = List of triangles touching vertex n) */
TriList = malloc (VertCount * sizeof(TriList));
if (TriList == NULL)
Abort ("Insufficient memory for smooth triangles.", 4);
for (i = 0; i < VertCount; i++)
TriList[i] = NULL;
for (i = 0; i < TriCount; i++) {
Vert = Tri[i].VertA;
Temp = TriList[Vert];
TriList[Vert] = malloc (sizeof (*TriList));
if (TriList[Vert] == NULL)
Abort ("Insufficient memory for smooth triangles.", 4);
TriList[Vert]->TriNo = i;
TriList[Vert]->Next = Temp;
Vert = Tri[i].VertB;
Temp = TriList[Vert];
TriList[Vert] = malloc (sizeof (*TriList));
if (TriList[Vert] == NULL)
Abort ("Insufficient memory for smooth triangles.", 4);
TriList[Vert]->TriNo = i;
TriList[Vert]->Next = Temp;
Vert = Tri[i].VertC;
Temp = TriList[Vert];
TriList[Vert] = malloc (sizeof (*TriList));
if (TriList[Vert] == NULL)
Abort ("Insufficient memory for smooth triangles.", 4);
TriList[Vert]->TriNo = i;
TriList[Vert]->Next = Temp;
}
}
void DumpTriIndex()
{
int i;
for (i = 0; i < VertCount; i++)
free (TriList[i]);
free (TriList);
}
void VertNormal (Triangle *T, Vector *NormA, Vector *NormB, Vector *NormC)
{
TriangleNode *p;
Vector Normal, CurrNorm;
VectInit (NormA, 0.0, 0.0, 0.0);
VectInit (NormB, 0.0, 0.0, 0.0);
VectInit (NormC, 0.0, 0.0, 0.0);
TriNormal (T, &CurrNorm);
for (p = TriList[T->VertA]; p != NULL; p = p->Next) {
TriNormal (&Tri[p->TriNo], &Normal);
if (VectAngle (&CurrNorm, &Normal) < Smooth)
VectAdd (NormA, NormA, &Normal);
}
for (p = TriList[T->VertB]; p != NULL; p = p->Next) {
TriNormal (&Tri[p->TriNo], &Normal);
if (VectAngle (&CurrNorm, &Normal) < Smooth)
VectAdd (NormB, NormB, &Normal);
}
for (p = TriList[T->VertC]; p != NULL; p = p->Next) {
TriNormal (&Tri[p->TriNo], &Normal);
if (VectAngle (&CurrNorm, &Normal) < Smooth)
VectAdd (NormC, NormC, &Normal);
}
VectScale (NormA, 1.0/VectMag (NormA));
VectScale (NormB, 1.0/VectMag (NormB));
VectScale (NormC, 1.0/VectMag (NormC));
}
void TriNormal (Triangle *T, Vector *Normal)
{
Vector AB, AC;
float Mag;
VectSub (&AB, &Vert[T->VertB], &Vert[T->VertA]);
VectSub (&AC, &Vert[T->VertC], &Vert[T->VertA]);
CrossProd (Normal, &AC, &AB);
Mag = VectMag (Normal);
if (Mag > 0.0)
VectScale (Normal, 1.0/Mag);
else
VectInit (Normal, 0.0, 0.0, 0.0);
}
void WriteDKBObject()
{
int i, j;
boolean Start;
Vector NormA, NormB, NormC;
if (Smooth > 0.0)
BuildTriIndex();
DegenTri = 0;
for (i = 0; i < 16; i++) {
Start = false;
VectInit (&ObjMin, +1e8, +1e8, +1e8);
VectInit (&ObjMax, -1e8, -1e8, -1e8);
for (j = 0; j < TriCount; j++) {
if (Tri[j].Colour == i) {
if (!Start) {
Start = true;
fprintf (g, " OBJECT {%s, Pal #%d}\n", ObjName, i);
fprintf (g, " UNION\n");
}
if (Degenerate (&Tri[j]))
++DegenTri; /* Exclude degenerate triangles */
else {
if (Smooth > 0.0) {
/* Compute vertex normals for smooth triangle */
VertNormal (&Tri[j], &NormA, &NormB, &NormC);
fprintf (g, " SMOOTH_TRIANGLE ");
PrintVector (g, &Vert[Tri[j].VertA]);
PrintVector (g, &NormA);
PrintVector (g, &Vert[Tri[j].VertB]);
PrintVector (g, &NormB);
PrintVector (g, &Vert[Tri[j].VertC]);
PrintVector (g, &NormC);
fprintf (g, "END_TRIANGLE\n");
}
else {
fprintf (g, " TRIANGLE ");
PrintVector (g, &Vert[Tri[j].VertA]);
PrintVector (g, &Vert[Tri[j].VertB]);
PrintVector (g, &Vert[Tri[j].VertC]);
fprintf (g, "END_TRIANGLE\n");
}
MinVector (&ObjMin, &Vert[Tri[j].VertA]);
MinVector (&ObjMin, &Vert[Tri[j].VertB]);
MinVector (&ObjMin, &Vert[Tri[j].VertC]);
MaxVector (&ObjMax, &Vert[Tri[j].VertA]);
MaxVector (&ObjMax, &Vert[Tri[j].VertB]);
MaxVector (&ObjMax, &Vert[Tri[j].VertC]);
if (Display)
PlotTriangle (&Tri[j]);
}
}
}
if (Start) {
fprintf (g, " END_UNION\n\n");
fprintf (g, " BOUNDED_BY\n");
fprintf (g, " INTERSECTION\n");
fprintf (g, " PLANE <+1.0 0.0 0.0> %.2f END_PLANE\n", +ObjMax.x);
fprintf (g, " PLANE <-1.0 0.0 0.0> %.2f END_PLANE\n", -ObjMin.x);
fprintf (g, " PLANE <0.0 +1.0 0.0> %.2f END_PLANE\n", +ObjMax.y);
fprintf (g, " PLANE <0.0 -1.0 0.0> %.2f END_PLANE\n", -ObjMin.y);
fprintf (g, " PLANE <0.0 0.0 +1.0> %.2f END_PLANE\n", +ObjMax.z);
fprintf (g, " PLANE <0.0 0.0 -1.0> %.2f END_PLANE\n", -ObjMin.z);
fprintf (g, " END_INTERSECTION\n");
fprintf (g, " END_BOUND\n\n");
fprintf (g, " TEXTURE\n");
fprintf (g, " DefaultTexture\n");
fprintf (g, " COLOUR RED %.3f GREEN %.3f BLUE %.3f\n",
Pal[i].Red, Pal[i].Green, Pal[i].Blue);
fprintf (g, " END_TEXTURE\n");
fprintf (g, " COLOUR RED %.3f GREEN %.3f BLUE %.3f\n",
Pal[i].Red, Pal[i].Green, Pal[i].Blue);
fprintf (g, " END_OBJECT {%s, Pal #%d}\n\n", ObjName, i);
}
}
if (Smooth > 0.0)
DumpTriIndex();
free (Vert); /* Free memory used by vertex/triangle lists */
free (Tri);
}
void WriteDKBSummary()
{
Vector Sky, Right, Direction;
int i;
fprintf (g, "END_COMPOSITE\n\n");
for (i = 0; i < 3; i++) {
if (LightOn[i]) {
fprintf (g, "OBJECT\n");
fprintf (g, " SPHERE <0.0 0.0 0.0> 1.0 END_SPHERE\n");
fprintf (g, " TRANSLATE <%.2f %.2f %.2f>\n", LightPos[i].x, LightPos[i].y, LightPos[i].z);
fprintf (g, " TEXTURE\n");
fprintf (g, " COLOUR RED %.3f GREEN %.3f BLUE %.3f\n",
LightBright[i], LightBright[i], LightBright[i]);
fprintf (g, " DIFFUSE 0.0\n");
fprintf (g, " AMBIENT 1.0\n");
fprintf (g, " END_TEXTURE\n");
fprintf (g, " LIGHT_SOURCE\n");
fprintf (g, " COLOUR RED %.3f GREEN %.3f BLUE %.3f\n",
LightBright[i], LightBright[i], LightBright[i]);
fprintf (g, "END_OBJECT\n\n");
}
}
VectInit (&Sky, 0.0, 1.0, 0.0);
VectSub (&Direction, &LookAt, &ViewPoint);
CrossProd (&Right, &Sky, &Direction);
VectScale (&Right, 1.33333/VectMag(&Right));
fprintf (g, "VIEW_POINT\n");
fprintf (g, " LOCATION "); PrintVector (g, &ViewPoint); fprintf (g, "\n");
fprintf (g, " LOOK_AT "); PrintVector (g, &LookAt); fprintf (g, "\n");
fprintf (g, " SKY "); PrintVector (g, &Sky); fprintf (g, "\n");
fprintf (g, " RIGHT "); PrintVector (g, &Right); fprintf (g, "\n");
fprintf (g, "END_VIEW_POINT\n\n");
}
void VectAdd (Vector *V1, Vector *V2, Vector *V3)
{
V1->x = V2->x + V3->x;
V1->y = V2->y + V3->y;
V1->z = V2->z + V3->z;
}
void VectSub (Vector *V1, Vector *V2, Vector *V3)
{
V1->x = V2->x - V3->x;
V1->y = V2->y - V3->y;
V1->z = V2->z - V3->z;
}
void VectScale (Vector *V, float k)
{
V->x = k*V->x;
V->y = k*V->y;
V->z = k*V->z;
}
float VectMag (Vector *V)
{
return sqrt((V->x * V->x) + (V->y * V->y) + (V->z * V->z));
}
float DotProd (Vector *V1, Vector *V2)
{
return (V1->x*V2->x + V1->y*V2->y + V1->z*V2->z);
}
void CrossProd (Vector *V1, Vector *V2, Vector *V3)
{
V1->x = (V2->y * V3->z) - (V2->z * V3->y);
V1->y = (V2->z * V3->x) - (V2->x * V3->z);
V1->z = (V2->x * V3->y) - (V2->y * V3->x);
}
void VectCopy (Vector *V1, Vector *V2)
{
V1->x = V2->x;
V1->y = V2->y;
V1->z = V2->z;
}
void VectInit (Vector *V, float x, float y, float z)
{
V->x = x;
V->y = y;
V->z = z;
}
float VectAngle (Vector *V1, Vector *V2)
{
float Mag1, Mag2, Angle;
Mag1 = VectMag(V1);
Mag2 = VectMag(V2);
if (Mag1 > 0.0 && Mag2 > 0.0)
Angle = (180.0/M_PI) * acos(min(1.0, DotProd(V1,V2)/(Mag1 * Mag2)));
else
Angle = 0.0;
return Angle;
}
void InitDisplay()
{
#ifdef __TURBOC__
int graphdriver = DETECT, graphmode;
Vector Temp;
VectSub (&Nz, &LookAt, &ViewPoint);
VectScale (&Nz, 1.0/VectMag(&Nz));
VectCopy (&Temp, &Nz);
VectScale (&Temp, Nz.y/DotProd(&Nz, &Nz));
VectInit (&Ny, 0.0, 1.0, 0.0);
VectSub (&Ny, &Ny, &Temp);
VectScale (&Ny, 1.0/VectMag(&Ny));
CrossProd (&Nx, &Ny, &Nz);
if (Display) {
initgraph (&graphdriver, &graphmode, "");
if (graphresult() != grOk) {
printf ("Error initializing graphics display.\n");
Display = false;
}
}
#endif
}
void PlotTriangle (Triangle *Tr)
{
#ifdef __TURBOC__
Vector a, b, c, T;
int ax, ay, bx, by, cx, cy, Shade;
float rd, gr, bl;
VectCopy (&a, &Vert[Tr->VertA]);
VectCopy (&b, &Vert[Tr->VertB]);
VectCopy (&c, &Vert[Tr->VertC]);
VectSub (&a, &a, &ViewPoint);
T.x = DotProd (&a, &Nx);
T.y = DotProd (&a, &Ny);
T.z = DotProd (&a, &Nz);
VectCopy (&a, &T);
VectSub (&b, &b, &ViewPoint);
T.x = DotProd (&b, &Nx);
T.y = DotProd (&b, &Ny);
T.z = DotProd (&b, &Nz);
VectCopy (&b, &T);
VectSub (&c, &c, &ViewPoint);
T.x = DotProd (&c, &Nx);
T.y = DotProd (&c, &Ny);
T.z = DotProd (&c, &Nz);
VectCopy (&c, &T);
/* Don't plot anything that's behind you */
if (a.z <= 0.0 || b.z <= 0.0 || c.z <= 0.0)
return;
ax = (0.75*a.x/a.z + 0.5)*getmaxx();
bx = (0.75*b.x/b.z + 0.5)*getmaxx();
cx = (0.75*c.x/c.z + 0.5)*getmaxx();
ay = (0.5 - a.y/a.z)*getmaxy();
by = (0.5 - b.y/b.z)*getmaxy();
cy = (0.5 - c.y/c.z)*getmaxy();
Shade = 0;
bl = Pal[Tr->Colour].Blue;
gr = Pal[Tr->Colour].Green;
rd = Pal[Tr->Colour].Red;
Shade = 1*(bl > 0.3) + 2*(gr > 0.3) + 4*(rd > 0.3) + 8*(bl+gr+rd > 1.5);
if (Shade == 0)
Shade = 8;
setcolor (Shade);
moveto (ax, ay);
lineto (bx, by);
lineto (cx, cy);
lineto (ax, ay);
#endif
}
void CloseDisplay()
{
#ifdef __TURBOC__
printf ("Conversion complete.\nPress any key.");
getch();
closegraph();
#endif
}