//================================================================================
// Frustum_TransformToWorldSpace
//================================================================================
void Frustum_TransformToWorldSpace(const Frustum_Info *In, const geCamera *Camera, Frustum_Info *Out)
{
int32 i;
GFX_Plane *pPlane1, *pPlane2;
assert(In != Out);
pPlane1 = (GFX_Plane*)In->Planes;
pPlane2 = Out->Planes;
// Rotate all the planes
for (i=0; i<In->NumPlanes; i++, pPlane1++, pPlane2++)
{
pPlane2->Type = pPlane1->Type;
SetWorldspaceClipPlane(pPlane1, Camera, pPlane2);
pPlane2->Dist = geVec3d_DotProduct(geCamera_GetPov(Camera), &pPlane2->Normal) - CLIP_PLANE_EPSILON;
if (pPlane1->Dist) // Add the original dist back in
{
geVec3d Vect;
geVec3d_Clear(&Vect);
geVec3d_AddScaled(&Vect, &pPlane1->Normal, pPlane1->Dist, &Vect);
BackRotateVector(&Vect, &Vect, geCamera_GetCameraSpaceXForm(Camera));
pPlane2->Dist += geVec3d_DotProduct(&pPlane2->Normal, &Vect);
}
}
Out->NumPlanes = In->NumPlanes;
// Get BBox info for fast BBox rejection against frustum...
SetUpFrustumBBox(Out);
}
void
Projector::SetUpFrustum()
{
double angle, s, c;
Vec3 normal;
angle = XAngle();
s = sin(angle);
c = cos(angle);
// Left clip plane
normal.x = (float) s;
normal.y = (float) 0;
normal.z = (float) c;
view_planes[0].normal = normal;
view_planes[0].distance = CLIP_PLANE_EPSILON;
SetWorldspaceClipPlane(normal, world_planes[0]);
// Right clip plane
normal.x = (float) -s;
view_planes[1].normal = normal;
view_planes[1].distance = CLIP_PLANE_EPSILON;
SetWorldspaceClipPlane(normal, world_planes[1]);
angle = YAngle();
s = sin(angle);
c = cos(angle);
// Bottom clip plane
normal.x = (float) 0;
normal.y = (float) s;
normal.z = (float) c;
view_planes[2].normal = normal;
view_planes[2].distance = CLIP_PLANE_EPSILON;
SetWorldspaceClipPlane(normal, world_planes[2]);
// Top clip plane
normal.y = (float) -s;
view_planes[3].normal = normal;
view_planes[3].distance = CLIP_PLANE_EPSILON;
SetWorldspaceClipPlane(normal, world_planes[3]);
}
//================================================================================
// Frustum_RotateToWorldSpace
//================================================================================
void Frustum_RotateToWorldSpace(Frustum_Info *In, geCamera *Camera, Frustum_Info *Out)
{
int32 i;
GFX_Plane *pPlane1, *pPlane2;
assert(In != Out);
pPlane1 = In->Planes;
pPlane2 = Out->Planes;
// Rotate all the planes
for (i=0; i<In->NumPlanes; i++, pPlane1++, pPlane2++)
{
pPlane2->Type = pPlane1->Type;
SetWorldspaceClipPlane(pPlane1, Camera, pPlane2);
pPlane2->Dist = 0.0f; // We are just rotating, so set dist to 0
if (pPlane1->Dist) // Add the original dist back in
{
geVec3d Vect;
geVec3d_Clear(&Vect);
geVec3d_AddScaled(&Vect, &pPlane1->Normal, pPlane1->Dist, &Vect);
BackRotateVector(&Vect, &Vect, geCamera_GetCameraSpaceXForm(Camera));
pPlane2->Dist += geVec3d_DotProduct(&pPlane2->Normal, &Vect);
}
}
Out->NumPlanes = In->NumPlanes;
// Get BBox info for fast BBox rejection against frustum...
SetUpFrustumBBox(Out);
}
