http://collada.org/public_forum/ Digital Asset and FX Exchange Schema en Wed, 19 Jun 2013 15:51:27 GMT vBulletin 60 http://collada.org/public_forum/images/misc/rss.png http://collada.org/public_forum/ http://collada.org/public_forum/showthread.php/1658-Can-t-use-the-Inverse-Bind-Matrix-correctly?goto=newpost Thu, 23 May 2013 18:22:23 GMT Hi. When i am doing my animation i take the inverse bind matrix that I am given and multiply it by the animation for the bone, by the bind shape... Hi. When i am doing my animation i take the inverse bind matrix that I am given and multiply it by the animation for the bone, by the bind shape matrix by the vertex by the world view projection matrix. If I use the matrix that I get from the inv_bind_matrix source, the meshControllerMatrix, I don't get anything in my viewer. However, if I just take the inverse of the bone given by the node specification in the visual scene branch, then I do get animation but it seems to be scaled wrong. instead of staying in place and rotating on the x axis, it swings about a translation in the same general direction but moves all over the place. When I use the inv_bind_matrix though nothing shows up. Can I be missing a step? ]]> Design Discussions alecto http://collada.org/public_forum/showthread.php/1658-Can-t-use-the-Inverse-Bind-Matrix-correctly http://collada.org/public_forum/showthread.php/1657-Sampling-in-COLLADA-objects?goto=newpost Tue, 21 May 2013 07:14:48 GMT Hi all, Basic problem is that I need to sample on the 1D curves (in 3D space), 2D surfaces (in 3D space) or 3D volumes specified in COLLADA.... Hi all,

Basic problem is that I need to sample on the 1D curves (in 3D space), 2D surfaces (in 3D space) or 3D volumes specified in COLLADA. Mathematically it leads to the mapping, e.g., of the 3D surface to the 2D limited plane (XY). So that by choosing point x in [0,1] and y in [0,1] we could get a unique point on the surface. The same stands for arbitrary 1D curves in 3D space and searching for a function that maps an arbitrary curve to the interval [0,1].

I would be grateful for any hints or suggestions. Please excuse me, if the question has no relation to this forum.

Best regards,
Sergey ]]> Implementation Discussions Sergey http://collada.org/public_forum/showthread.php/1657-Sampling-in-COLLADA-objects