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EnigmA AMIGA RUN 35 (1999)(G.R. Edizioni)(IT)[!][issue 1999-03].iso
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environ.cpp
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C/C++ Source or Header
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1997-08-17
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2KB
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80 lines
////////////////////////////////////////////////////////////
//
// ENVIRON.CPP - Environment Class
//
// Version: 1.03A
//
// History: 96/02/29 - Created.
// 96/04/01 - Version 1.03A release.
//
// Compilers: Microsoft Visual C/C++ Professional V1.5
// Borland C++ Version 4.5
//
// Author: Ian Ashdown, P.Eng.
// byHeart Software Limited
// 620 Ballantree Road
// West Vancouver, B.C.
// Canada V7S 1W3
// Tel. (604) 922-6148
// Fax. (604) 987-7621
//
// Copyright 1994-1996 byHeart Software Limited
//
// The following source code has been derived from:
//
// Ashdown, I. 1994. Radiosity: A Programmer's
// Perspective. New York, NY: John Wiley & Sons.
//
// It may be freely copied, redistributed, and/or modified
// for personal use ONLY, as long as the copyright notice
// is included with all source code files.
//
////////////////////////////////////////////////////////////
#include "environ.h"
// Calculate environment extents
void Environ::CalcExtents()
{
double vx, vy, vz; // Vertex co-ordinates
Instance *pinst; // Instance pointer
// Initialize extents
max_x = max_y = max_z = -MAX_VALUE;
min_x = min_y = min_z = MAX_VALUE;
// Walk the instance list
pinst = pinsthd;
while (pinst != NULL)
{
// Get vertex co-ordinates
pinst->CalcExtents();
vx = pinst->GetMin_X();
vy = pinst->GetMin_Y();
vz = pinst->GetMin_Z();
// Update x-axis extents
if (vx < min_x)
min_x = vx;
if (vy < min_y)
min_y = vy;
if (vz < min_z)
min_z = vz;
vx = pinst->GetMax_X();
vy = pinst->GetMax_Y();
vz = pinst->GetMax_Z();
// Update x-axis extents
if (vx > max_x)
max_x = vx;
if (vy > max_y)
max_y = vy;
if (vz > max_z)
max_z = vz;
pinst = pinst->GetNext();
}
}