ClosestRayResultCallback crash

[vexator]

i'm trying to perform a basic ray test. everything's set up fine, my physics world is populated with both static and dynamic meshes. however, this crashes as soon as a body is hit:

Code: Select all

btVector3 rayTo = cameraPosition+viewDir*1000.0f;

btCollisionWorld::ClosestRayResultCallback rayCallback( cameraPosition, rayTo );
g_rkWorld->rayTest( cameraPosition, rayTo, rayCallback);

any ideas? I'm using Bullet 2.75.

[Erwin Coumans]

It can be anything. Can you reproduce it in a Bullet demo?

Can you update to Bullet 2.76 and export the scene to a .bullet file, zip and attach it?

Thanks,
Erwin

[vexator]

hi erwin, i got it working by upgrading to 2.76 and using btBvhTriangleMeshShapes for my static geometry. I was still using the old triangle mesh classes. picking now works, but the casted rays do not always seem to be right.

first question: is rayEnd only the direction vector, or should it also include the start offset?

Code: Select all

btVector3 rayStart = cameraPosition;
btVector3 rayEnd = /*cameraPosition+*/viewDir*1000.0f; <- do I have to add cameraPosition?

// perform ray cast
btCollisionWorld::ClosestRayResultCallback rayCallback( rayStart, rayEnd );
g_rkWorld->rayTest( rayStart, rayEnd, rayCallback );

[pico]

hi erwin, i got it working by upgrading to 2.76 and using btBvhTriangleMeshShapes for my static geometry. I was still using the old triangle mesh classes. picking now works, but the casted rays do not always seem to be right.

first question: is rayEnd only the direction vector, or should it also include the start offset?

Code: Select all

btVector3 rayStart = cameraPosition;
btVector3 rayEnd = /*cameraPosition+*/viewDir*1000.0f; <- do I have to add cameraPosition?

// perform ray cast
btCollisionWorld::ClosestRayResultCallback rayCallback( rayStart, rayEnd );
g_rkWorld->rayTest( rayStart, rayEnd, rayCallback );

Hi,

RayEnd is not a direction vector nor includes RayStart.

RayStart is the start of the ray in world coordinates.
RayEnd is the end of the ray in world coordinates.

[vexator]

yeah but if i want to shoot a ray from the camera position along the view direction, then it should be right like this, shouldn't it?

[pico]

yeah but if i want to shoot a ray from the camera position along the view direction, then it should be right like this, shouldn't it?

then rayStart=cameraPos and rayEnd=rayStart+viewDir*distance