102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*************************************************************************/
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/* */
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/* Copyright (c) 1994 Stanford University */
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/* */
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/* All rights reserved. */
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/* */
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/* Permission is given to use, copy, and modify this software for any */
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/* non-commercial purpose as long as this copyright notice is not */
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/* removed. All other uses, including redistribution in whole or in */
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/* part, are forbidden without prior written permission. */
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/* */
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/* This software is provided with absolutely no warranty and no */
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/* support. */
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/* */
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/*************************************************************************/
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/*
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* NAME
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* bbox.c
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*
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* DESCRIPTION
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* This file contains routines that read, inquire, and normalize bounding
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* boxes.
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*/
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#include <stdio.h>
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#include <math.h>
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#include "rt.h"
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/*
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* NAME
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* InquireBoundBoxValues - return min and max bound values for each coordinate axis
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*
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* SYNOPSIS
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* VOID InquireBoundBoxValues(pbb, minx, miny, minz, maxx, maxy, maxz)
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* BBOX *pbb; // Ptr to bounding box.
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* REAL *minx, *miny, *minz; // Near planes.
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* REAL *maxx, *maxy, *maxz; // Far planes.
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*
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* RETURNS
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* Nothing.
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*/
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VOID InquireBoundBoxValues(BBOX *pbb, REAL *minx, REAL *miny, REAL *minz, REAL *maxx, REAL *maxy, REAL *maxz)
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{
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*minx = pbb->dnear[0];
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*miny = pbb->dnear[1];
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*minz = pbb->dnear[2];
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*maxx = pbb->dfar[0];
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*maxy = pbb->dfar[1];
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*maxz = pbb->dfar[2];
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}
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/*
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* NAME
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* NormalizeBoundBox - normalize bounding box given a normalization matrix
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*
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* SYNOPSIS
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* VOID NormalizeBoundBox(bv, mat)
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* BBOX *pbb; // Ptr to bounding box.
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* MATRIX mat; // Normalization matrix.
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*
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* RETURNS
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* Nothing.
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*/
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VOID NormalizeBoundBox(BBOX *pbb, MATRIX mat)
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{
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POINT tmp;
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/* dnear and dfar are only vectors of length 3 */
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tmp[0] = pbb->dnear[0];
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tmp[1] = pbb->dnear[1];
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tmp[2] = pbb->dnear[2];
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tmp[3] = 1.0;
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VecMatMult(tmp, mat, tmp);
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pbb->dnear[0] = tmp[0];
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pbb->dnear[1] = tmp[1];
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pbb->dnear[2] = tmp[2];
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tmp[0] = pbb->dfar[0];
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tmp[1] = pbb->dfar[1];
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tmp[2] = pbb->dfar[2];
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tmp[3] = 1.0;
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VecMatMult(tmp, mat, tmp);
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pbb->dfar[0] = tmp[0];
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pbb->dfar[1] = tmp[1];
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pbb->dfar[2] = tmp[2];
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}
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