ray trace multiple items

ibelchamber · 2005-03-12T10:59:58

I'm fairly new to directx so I'm hoping there's an easy answer. I've got the basics going, drawing a number of shapes and controlling the view direction, etc. I'm now moving on to attempting to select shapes with the mouse. I'm working from varoius tutorials and samples, but there's one thing that doesn't make sense to me. I'm positiong my objects by adjusting the device world transform before drawing each one, then drawing the mesh, which I think is the right way to do it. But it means that the actual mesh is always local, whereever the shape is in world space, and however it may be rotated / scaled. So, when I use mesh.intersect to find out if my ray goes through the mesh as I draw it, all my shapes get selected when the mouse is in the middle, as that's where all the local meshes are. It seems to me I have to either: 1. Apply my scaling / transformations to the mesh, then draw it without changing the world transform 2. Recover the global mesh (if there is such a thing) after drawing all the items to it, then test the intersection on that. What is the correct way to do this? Thanks