private Selection GetSelection(int screenX, int screenY)
{
// Try to see what can be selected
Vector3 rayStart = GeometryMath.Unproject(new Vector3(screenX, Viewport.height - screenY, 0.1), ProjectionMatrix, Viewport);
Vector3 rayEnd = GeometryMath.Unproject(new Vector3(screenX, Viewport.height - screenY, IsPerspective ? 1.0 : -1.0), ProjectionMatrix, Viewport);
Vector3 rayDirection = (rayEnd - rayStart).GetNormalized();
bool closestHitOpaque = false;
double closestDistance = Double.MaxValue;
int closestPrimitiveTriangleIndex = -1;
DebugRenderPrimitive closestPrimitive = null;
List <DebugRenderPrimitive> debugRenderPrimitives = Session.DebugRenderStorage.GetCachedPrimitives();
foreach (DebugRenderPrimitive primitive in debugRenderPrimitives)
{
bool hitOpaque;
int triangleIndex;
Vector3 intersection = new Vector3(0, 0, 0);
if (primitive.RayCheck(Session.PlaybackPosition, rayStart, rayDirection, out triangleIndex, out hitOpaque, out intersection))
{
double distance = rayStart.Distance(intersection);
if (distance < closestDistance)
{
closestPrimitiveTriangleIndex = triangleIndex;
closestDistance = distance;
closestPrimitive = primitive;
closestHitOpaque = hitOpaque;
}
}
}
return(closestPrimitive != null ? new Selection(closestPrimitive, closestPrimitiveTriangleIndex, closestHitOpaque) : null);
}
