Before I finished my tutorial and sample, I had originally resorted to a bit of a magic number hack when my XNA generated bounding spheres appeared too small. I just experimented with multiplying by different numbers until it looked about right for the model. As it turned out though, it was because my rendering code originally didn’t take into consideration any Bone Transforms. Once I implemented those things came right with no magic number required.

Another thing to consider, is within the modelling tool itself. When you adjust various pieces of your model in whatever tool you use, they can remain as transformations that potentially effect the exported model. Each tool will have it’s own way of committing these transforms. In XSI I believe you have to “Freeze all transforms”.

Your mileage may vary. I’m really no expert at any of the above. It’s just been trial and error experience for me. I could be talking bollocks, but this is what worked for me in the end.

I am just a newbie here. I just tried out your code to use on my FPS style game (basically in Half life style). The problem I got is my 3D model mesh is not properly allocating in the boundingspheres. The coordinate is not right the scaling also wrong. How could I make this spheres to world coordinate?

Any suggestion?

Thx

But I’m not sure it’s the right version that’s up for download. Because I downloaded it and when I tried it the Xbox360 controller didn’t rumble and all of the spheres moved even if the cursor was far far away.

Will you update the tutorial as well?