Recently,I am studying bullet3 and DirectX 11.And I got some wired results like the attachments shows.It should be a sphere not a flat plane.
I extended the btIDebugDraw to draw lines.The draw line api works correctly independently.And I traced the call stack and found there was some thing wrong with the bullet transform .I have no idea about how it acts like that. So I ask for help here.Any help or tips will be apreciated.