/*
==============
Terrain_Ray
Itersects a ray with a terrain
Returns the face hit and the distance along the ray the intersection occured at
Returns NULL and 0 if not hit at all
==============
*/
terrainFace_t *Terrain_Ray( vec3_t origin, vec3_t dir, brush_t *b, float *dist ) {
terrainMesh_t *pm;
int h;
int w;
int x;
int y;
float best_t;
float t;
terravert_t a0;
terravert_t a1;
terravert_t a2;
terravert_t b0;
terravert_t b1;
terravert_t b2;
terrainVert_t *vert;
terrainFace_t *best;
best = NULL;
best_t = WORLD_SIZE * 2;
pm = b->pTerrain;
h = pm->height - 1;
w = pm->width - 1;
vert = pm->heightmap;
for( y = 0; y < h; y++, vert++ ) {
for( x = 0; x < w; x++, vert++ ) {
Terrain_GetTriangles( pm, x, y, &a0, &a1, &a2, &b0, &b1, &b2, NULL );
t = WORLD_SIZE * 2;
if ( RayTriangleIntersect( origin, dir, a2.xyz, a1.xyz, a0.xyz, &t ) ) {
if ( ( t >= 0 ) && ( t < best_t ) ) {
best = &vert->tri;
best_t = t;
}
}
t = WORLD_SIZE * 2;
if ( RayTriangleIntersect( origin, dir, b2.xyz, b1.xyz, b0.xyz, &t ) ) {
if ( ( t >= 0 ) && ( t < best_t ) ) {
best = &vert->tri;
best_t = t;
}
}
}
}
if ( !best ) {
*dist = 0;
return NULL;
}
*dist = best_t;
return best;
}
float Animated_Mesh::Ray_Tri_Intersect(const vec3& rayorig, const vec3& raydir) {
mat4 inverseW(GetWorld());
inverseW.inverse();
vec3 org(rayorig*inverseW), di(raydir);// transform these to the mesh's space so the checks are in object space, not world space
TransformNormal(di, inverseW);
// do all checks in OBJECT SPACE!!!
di*=20000.0f;//make sure the ray is long enough
if(Bounding_Volume.RayIntersect(org, di) == INFINITY) return INFINITY;// did not hit the aabb, therefore, we did not hit the object
if(IB.Stride == 4){
return RayTriangleIntersect(org, di, &Vertices[0], reinterpret_cast<const uint32_t*>(&Indices[0]),Indices.size()/2);
} else {
return RayTriangleIntersect(org, di, &Vertices[0],&Indices[0],Indices.size());
}
}
float Trans_Mesh::Ray_Tri_Intersect(const vec3& rayorig, const vec3& raydir, mat4& world, uint16_t startindex, uint16_t numindices) const{
world.inverse();
vec3 org(rayorig*world), di(raydir);// transform these to the mesh's space so the checks are in object space, not world space
TransformNormal(di, world);
// do all checks in OBJECT SPACE!!!
di*=20000.0f;//make sure the ray is long enough
return RayTriangleIntersect(org, di, &Vertices[0], &Indices[startindex],numindices);
}
