/*
* Get placement for a ray through a projected point.
*/
void CPerspectiveProjection3D::RayThroughPoint(const FLOAT3D &v3dViewPoint,
CPlacement3D &plRay) const
{
// check that the projection object is prepared for projecting
ASSERT(pr_Prepared);
/* Assume z coordinate of -1 and calculate x and y for that.
* These are in fact just the perspective formulae, solved for transformed point.
* The result is a direction in viewer space.
*/
FLOAT3D v3dDirection;
v3dDirection(1) = -(v3dViewPoint(1) - pr_ScreenCenter(1))/ppr_PerspectiveRatios(1);
v3dDirection(2) = -(v3dViewPoint(2) - pr_ScreenCenter(2))/ppr_PerspectiveRatios(2);
v3dDirection(3) = -1.0f;
// back-rotate the ray to absolute space
v3dDirection *= !pr_ViewerRotationMatrix;
// normalize the ray
v3dDirection.Normalize();
// now calculate the angles from the direction
DirectionVectorToAngles(v3dDirection, plRay.pl_OrientationAngle);
// position is same as viewer's
plRay.pl_PositionVector = pr_vViewerPosition;
}
bool pickTerrainSurface(TerrainVolume* terrainVolume, float startX, float startY, float startZ, float dirAndLengthX, float dirAndLengthY, float dirAndLengthZ, float* resultX, float* resultY, float* resultZ)
{
Vector3F v3dStart(startX, startY, startZ);
Vector3F v3dDirection(dirAndLengthX, dirAndLengthY, dirAndLengthZ);
//v3dDirection *= length;
RaycastTestFunctor<MaterialSet> raycastTestFunctor;
::PolyVox::RaycastResult myResult = terrainRaycastWithDirection(dynamic_cast<TerrainVolume*>(terrainVolume)->_getPolyVoxVolume(), v3dStart, v3dDirection, raycastTestFunctor, 0.5f);
if(myResult == ::PolyVox::RaycastResults::Interupted)
{
*resultX = raycastTestFunctor.mLastPos.getX();
*resultY = raycastTestFunctor.mLastPos.getY();
*resultZ = raycastTestFunctor.mLastPos.getZ();
return true;
}
return false;
}
