//-----------------------------------------------------------------------------
// Returns a random player spawnpoint.
//-----------------------------------------------------------------------------
SceneObject *SceneManager::GetRandomPlayerSpawnPoint()
{
// Get a random spawn point.
SceneObject *point = m_playerSpawnPoints->GetRandom();
// If the spawner's collision stamp equals the current frame stamp, then
// something has collided with the spawner. Alternatively this spawner may
// not be enabled. In either case, return NULL to indicate that a vacent
// spawn point was not found. The caller will have to try again later.
if( point->GetCollisionStamp() != m_frameStamp && point->GetEnabled() == true )
return point;
else
return NULL;
}
//-----------------------------------------------------------------------------
// Returns the result of a ray intersection with the scene and all its objects.
//-----------------------------------------------------------------------------
bool SceneManager::RayIntersectScene( RayIntersectionResult *result, D3DXVECTOR3 rayPosition, D3DXVECTOR3 rayDirection, bool checkScene, SceneObject *thisObject, bool checkObjects )
{
float hitDistance = 0.0f;
// Check if the ray needs to check for intersection with the scene.
if( checkScene == true )
{
// Go through all the faces in the scene, check for intersection.
for( unsigned long f = 0; f < m_totalFaces; f++ )
{
// Skip this face if its material is set to ignore rays.
if( m_faces[f].renderCache->GetMaterial()->GetIgnoreRay() == true )
continue;
// Check the ray against this face.
if( D3DXIntersectTri( (D3DXVECTOR3*)&m_vertices[m_faces[f].vertex0], (D3DXVECTOR3*)&m_vertices[m_faces[f].vertex1], (D3DXVECTOR3*)&m_vertices[m_faces[f].vertex2], &rayPosition, &rayDirection, NULL, NULL, &hitDistance ) == TRUE )
{
if( hitDistance < result->distance || result->material == NULL )
{
( *result ).distance = hitDistance;
( *result ).material = m_faces[f].renderCache->GetMaterial();
}
}
}
}
// Check if the ray needs to check for intersection with the objects.
if( checkObjects == true )
{
// Stores the ray in model space.
D3DXVECTOR3 rp, rd;
// Iterate all the objects in the scene, check for intersection.
SceneObject *object = m_dynamicObjects->GetFirst();
while( object != NULL )
{
// Only check this object if it is enabled, has a mesh and is not
// the calling object.
if( object->GetEnabled() == true && object->GetMesh() != NULL && object != thisObject )
{
// Transform the ray into model space.
D3DXMATRIX inverse;
D3DXMatrixInverse( &inverse, NULL, object->GetWorldMatrix() );
D3DXVec3TransformCoord( &rp, &rayPosition, &inverse );
D3DXVec3TransformNormal( &rd, &rayDirection, &inverse );
// Go through the list of frames in the object's mesh.
LinkedList< Frame > *frames = object->GetMesh()->GetFrameList();
frames->Iterate( true );
while( frames->Iterate() != NULL )
{
// Ignore this frame if it has no mesh.
if( frames->GetCurrent()->pMeshContainer == NULL )
continue;
// Check the ray against this frame's mesh.
BOOL hit;
D3DXIntersect( frames->GetCurrent()->pMeshContainer->MeshData.pMesh, &rp, &rd, &hit, NULL, NULL, NULL, &hitDistance, NULL, NULL );
if( hit == TRUE && ( hitDistance < result->distance || result->material == NULL ) )
{
( *result ).distance = hitDistance;
( *result ).material = object->GetMesh()->GetStaticMesh()->materials[0];
( *result ).hitObject = object;
}
}
}
// Go to the next object.
object = m_dynamicObjects->GetNext( object );
}
}
// Return false if no intersection occured.
if( result->material == NULL )
return false;
// Calculate the point of intersection.
( *result ).point = rayPosition + rayDirection * result->distance;
return true;
}
