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139 lines
6.6 KiB
C
139 lines
6.6 KiB
C
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/***************************************************************************
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* *
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* Module : rtintsec.h *
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* *
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* Purpose : Intersection tests on geometry primitives. *
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* *
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**************************************************************************/
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#ifndef RTINTSEC_H
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#define RTINTSEC_H
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/**
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* \defgroup rtintersect RtIntersection
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* \ingroup rttool
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*
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* Object Intersection Toolkit for RenderWare.
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*/
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/****************************************************************************
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Includes
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*/
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#include <rwcore.h>
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#include "rtintsec.rpe" /* automatically generated header file */
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/****************************************************************************
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Defines
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*/
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#define RTINTSECEPSILON (RwReal)(1e-8)
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#define RTINTSECEDGEEPS (RwReal)(1e-5)
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#define RtIntersectionLineTriangleMacro(_result, \
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_lineStart, _lineDelta, \
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_v0, _v1, _v2, \
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_distance) \
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MACRO_START \
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{ \
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RwV3d edge1, edge2, tVec, pVec, qVec; \
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RwReal det; \
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\
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/* Find vectors for two edges sharing vert0 */ \
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RwV3dSubMacro(&edge1, (_v1), (_v0)); \
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RwV3dSubMacro(&edge2, (_v2), (_v0)); \
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\
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/* Begin calculating determinant \
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* - also used to calculate U parameter */ \
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RwV3dCrossProductMacro(&pVec, (_lineDelta), &edge2); \
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\
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/* If determinant is \
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* + near zero, ray lies in plane of \
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* triangle \
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* + negative, triangle is backfacing \
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*/ \
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det = RwV3dDotProductMacro(&edge1, &pVec); \
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(_result) = (det > RTINTSECEPSILON); \
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\
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if ((_result)) \
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{ \
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RwReal lo, hi, u; \
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\
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/* Calculate bounds for parameters with tolerance */ \
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lo = - det*RTINTSECEDGEEPS; \
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hi = det - lo; \
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\
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/* Calculate U parameter and test bounds */ \
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RwV3dSubMacro(&tVec, (_lineStart), (_v0)); \
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u = RwV3dDotProductMacro(&tVec, &pVec); \
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(_result) = (u >= lo && u <= hi); \
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\
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if ((_result)) \
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{ \
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RwReal v; \
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\
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/* Calculate V parameter and test bounds */ \
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RwV3dCrossProductMacro(&qVec, &tVec, &edge1); \
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v = RwV3dDotProductMacro((_lineDelta), &qVec); \
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(_result) = (v >= lo && (u + v) <= hi); \
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\
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if ((_result)) \
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{ \
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/* Calculate t, \
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* and make sure intersection is in bounds of line */ \
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*(_distance) = RwV3dDotProductMacro(&edge2, &qVec); \
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\
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/* Within bounds of line? */ \
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(_result) = (*(_distance) >= lo && *(_distance) <= hi); \
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\
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if ((_result)) \
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{ \
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*(_distance) = ((*(_distance)) / (det)); \
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} \
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} \
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} \
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} \
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} \
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MACRO_STOP
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/****************************************************************************
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Global Types
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*/
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/* RWPUBLIC */
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/****************************************************************************
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Function prototypes
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*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/* Line intersections */
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extern RwBool
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RtIntersectionLineTriangle(RwV3d *lineStart, RwV3d *lineDelta,
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RwV3d *v0, RwV3d *v1, RwV3d *v2,
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RwReal *distance);
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/* Sphere intersections */
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extern RwBool
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RtIntersectionSphereTriangle(RwSphere *sphere,
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RwV3d *v0, RwV3d *v1, RwV3d *v2,
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RwV3d *normal,
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RwReal *distance);
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/* BBox intersections */
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extern RwBool
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RtIntersectionBBoxTriangle(RwBBox *bbox, RwV3d *v0, RwV3d *v1, RwV3d *v2);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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/* RWPUBLICEND */
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#endif /* RTINTSEC_H */
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