/////////////////////////////////////
// Name: OBJIsIntersectRay
// Purpose: checks to see if the given
// object is intersecting a ray
// Output: pFaceIndex, pU, pV, pDist
// Return: true if intersect
/////////////////////////////////////
PUBLIC bool OBJIsIntersectRay(hOBJ obj, D3DXVECTOR3 *pRayPos, D3DXVECTOR3 *pRayDir)
{
//push world stack and set this object's world mtx
g_pWrldStack->Push();
g_pWrldStack->MultMatrix(&obj->wrldMtx.mtxTrans);
//check the base model
D3DXVECTOR3 ctr=obj->theMdl->bound.center;
//D3DXMATRIX mtxView;
//g_p3DDevice->GetTransform( D3DTS_VIEW, &mtxView );
//D3DXVec3TransformCoord(&ctr, &ctr, &mtxView);
D3DXVec3TransformCoord(&ctr, &ctr, g_pWrldStack->GetTop());
if(D3DXSphereBoundProbe(&ctr, obj->theMdl->bound.radius, pRayPos, pRayDir))
{ g_pWrldStack->Pop(); return true; }
//check for children
hOBJ thisObj;
for(LISTPTR::iterator i = obj->objNode->begin(); i != obj->objNode->end(); ++i)
{
thisObj = (hOBJ)(*i);
if(OBJIsIntersectRay(thisObj, pRayPos, pRayDir))
return true;
}
//take this junk out!
g_pWrldStack->Pop();
return false;
}
BOOL BoundElipsoidIntersect ( D3DXVECTOR3 mid, D3DXVECTOR3 e, D3DXVECTOR3 o_pos, D3DXVECTOR3 n_pos )
{
mid.x /= e.x;
mid.y /= e.y;
mid.z /= e.z;
o_pos.x /= e.x;
o_pos.y /= e.y;
o_pos.z /= e.z;
n_pos.x /= e.x;
n_pos.y /= e.y;
n_pos.z /= e.z;
if ( D3DXSphereBoundProbe ( &mid, 1, &o_pos, &( n_pos - o_pos ) ) &&
D3DXSphereBoundProbe ( &mid, 1, &n_pos, &( o_pos - n_pos ) ) )
return TRUE;
return FALSE;
}
float RAY::Intersect(BSPHERE bSphere)
{
if(D3DXSphereBoundProbe(&bSphere.center, bSphere.radius, &org, &dir))
return D3DXVec3Length(&(bSphere.center - org));
else return -1.0f;
}
static void D3DXBoundProbeTest(void)
{
BOOL result;
D3DXVECTOR3 bottom_point, center, top_point, raydirection, rayposition;
FLOAT radius;
/*____________Test the Box case___________________________*/
bottom_point.x = -3.0f; bottom_point.y = -2.0f; bottom_point.z = -1.0f;
top_point.x = 7.0f; top_point.y = 8.0f; top_point.z = 9.0f;
raydirection.x = -4.0f; raydirection.y = -5.0f; raydirection.z = -6.0f;
rayposition.x = 5.0f; rayposition.y = 5.0f; rayposition.z = 11.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == TRUE, "expected TRUE, received FALSE\n");
raydirection.x = 4.0f; raydirection.y = 5.0f; raydirection.z = 6.0f;
rayposition.x = 5.0f; rayposition.y = 5.0f; rayposition.z = 11.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == FALSE, "expected FALSE, received TRUE\n");
rayposition.x = -4.0f; rayposition.y = 1.0f; rayposition.z = -2.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == TRUE, "expected TRUE, received FALSE\n");
bottom_point.x = 1.0f; bottom_point.y = 0.0f; bottom_point.z = 0.0f;
top_point.x = 1.0f; top_point.y = 0.0f; top_point.z = 0.0f;
rayposition.x = 0.0f; rayposition.y = 1.0f; rayposition.z = 0.0f;
raydirection.x = 0.0f; raydirection.y = 3.0f; raydirection.z = 0.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == FALSE, "expected FALSE, received TRUE\n");
bottom_point.x = 1.0f; bottom_point.y = 2.0f; bottom_point.z = 3.0f;
top_point.x = 10.0f; top_point.y = 15.0f; top_point.z = 20.0f;
raydirection.x = 7.0f; raydirection.y = 8.0f; raydirection.z = 9.0f;
rayposition.x = 3.0f; rayposition.y = 7.0f; rayposition.z = -6.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == TRUE, "expected TRUE, received FALSE\n");
bottom_point.x = 0.0f; bottom_point.y = 0.0f; bottom_point.z = 0.0f;
top_point.x = 1.0f; top_point.y = 1.0f; top_point.z = 1.0f;
raydirection.x = 0.0f; raydirection.y = 1.0f; raydirection.z = .0f;
rayposition.x = -3.0f; rayposition.y = 0.0f; rayposition.z = 0.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == FALSE, "expected FALSE, received TRUE\n");
raydirection.x = 1.0f; raydirection.y = 0.0f; raydirection.z = .0f;
rayposition.x = -3.0f; rayposition.y = 0.0f; rayposition.z = 0.0f;
result = D3DXBoxBoundProbe(&bottom_point, &top_point, &rayposition, &raydirection);
ok(result == TRUE, "expected TRUE, received FALSE\n");
/*____________Test the Sphere case________________________*/
radius = sqrt(77.0f);
center.x = 1.0f; center.y = 2.0f; center.z = 3.0f;
raydirection.x = 2.0f; raydirection.y = -4.0f; raydirection.z = 2.0f;
rayposition.x = 5.0f; rayposition.y = 5.0f; rayposition.z = 9.0f;
result = D3DXSphereBoundProbe(¢er, radius, &rayposition, &raydirection);
ok(result == TRUE, "expected TRUE, received FALSE\n");
rayposition.x = 45.0f; rayposition.y = -75.0f; rayposition.z = 49.0f;
result = D3DXSphereBoundProbe(¢er, radius, &rayposition, &raydirection);
ok(result == FALSE, "expected FALSE, received TRUE\n");
rayposition.x = 5.0f; rayposition.y = 11.0f; rayposition.z = 9.0f;
result = D3DXSphereBoundProbe(¢er, radius, &rayposition, &raydirection);
ok(result == FALSE, "expected FALSE, received TRUE\n");
}