82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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//#define CULL_BBOX
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/*
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This file does not reference any globals, and has these entry points:
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void CM_ClearLevelPatches( void );
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struct patchCollide_s *CM_GeneratePatchCollide( int width, int height, const vec3_t *points );
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void CM_TraceThroughPatchCollide( traceWork_t *tw, const struct patchCollide_s *pc );
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qboolean CM_PositionTestInPatchCollide( traceWork_t *tw, const struct patchCollide_s *pc );
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void CM_DrawDebugSurface( void (*drawPoly)(int color, int numPoints, flaot *points) );
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Issues for collision against curved surfaces:
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Surface edges need to be handled differently than surface planes
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Plane expansion causes raw surfaces to expand past expanded bounding box
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Position test of a volume against a surface is tricky.
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Position test of a point against a surface is not well defined, because the surface has no volume.
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Tracing leading edge points instead of volumes?
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Position test by tracing corner to corner? (8*7 traces -- ouch)
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coplanar edges
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triangulated patches
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degenerate patches
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endcaps
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degenerate
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WARNING: this may misbehave with meshes that have rows or columns that only
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degenerate a few triangles. Completely degenerate rows and columns are handled
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properly.
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*/
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#define MAX_FACETS 1024
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#define MAX_PATCH_PLANES 2048
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typedef struct {
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float plane[4];
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int signbits; // signx + (signy<<1) + (signz<<2), used as lookup during collision
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} patchPlane_t;
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typedef struct {
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int surfacePlane;
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int numBorders; // 3 or four + 6 axial bevels + 4 or 3 * 4 edge bevels
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int borderPlanes[4+6+16];
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int borderInward[4+6+16];
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qboolean borderNoAdjust[4+6+16];
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} facet_t;
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typedef struct patchCollide_s {
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vec3_t bounds[2];
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int numPlanes; // surface planes plus edge planes
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patchPlane_t *planes;
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int numFacets;
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facet_t *facets;
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} patchCollide_t;
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#define MAX_GRID_SIZE 129
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typedef struct {
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int width;
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int height;
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qboolean wrapWidth;
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qboolean wrapHeight;
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vec3_t points[MAX_GRID_SIZE][MAX_GRID_SIZE]; // [width][height]
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} cGrid_t;
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#define SUBDIVIDE_DISTANCE 16 //4 // never more than this units away from curve
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#define PLANE_TRI_EPSILON 0.1
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#define WRAP_POINT_EPSILON 0.1
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struct patchCollide_s *CM_GeneratePatchCollide( int width, int height, vec3_t *points );
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