Hi default implementation uses vertex attribs from slot 11 upwards for bone weights, and most implementations have GL_MAX_VERTEX_ATTRIBS = 16, so with more than 4 attributes you are probably hitting hardware limits on vertex attributes count, i think gl error comes from this too.
Cheers. 29.11.2012, 01:01, "Peterakos" <[email protected]>: > Hello. > > I use the default RigTransformHardware for skinning on a dae Model > with skeleton. > My model consists of 4 RigGeometries (image 1). The number of bones > per vertex is 7, 2, 20 and 15 respectively. > After enabling the OSG_NOTIFY as INFO i see that it creates vec4 > boneWeightX attributes based on the 4 previous numbers > (num_of_bones/2). > > The vertex shader i use for skinning is the following: > > #version 120 > > attribute vec4 boneWeight0; > attribute vec4 boneWeight1; > attribute vec4 boneWeight2; > attribute vec4 boneWeight3; > > uniform int nbBonesPerVertex; > uniform mat4 matrixPalette[MAX_MATRIX]; > > vec4 position; > > void computeAcummulatedNormalAndPosition(vec4 boneWeight){ > int matrixIndex = int(boneWeight[0]); > float matrixWeight = boneWeight[1] ; > mat4 matrix = matrixPalette[matrixIndex]; > position += matrixWeight * (matrix * gl_Vertex ); > } > > void main( void ){ > position = vec4(0.0,0.0,0.0,0.0); > > if (nbBonesPerVertex > 0) > computeAcummulatedNormalAndPosition(boneWeight0); > if (nbBonesPerVertex > 2) > computeAcummulatedNormalAndPosition(boneWeight1); > if (nbBonesPerVertex > 4) > computeAcummulatedNormalAndPosition(boneWeight2); > if (nbBonesPerVertex > 6) > computeAcummulatedNormalAndPosition(boneWeight3); > > gl_Position = gl_ModelViewProjectionMatrix * position; > } > > The problem is that when i try to use all the boneWeight attributes it > creates (which are 10), the model breaks (image 2). > On the other hand the code above (with only 4 attributes) works like > the RigTransformSoftware. > > On a different high detail model (which creates 25 bone weight > attributes max), i get the following results: > -With only the first 4 attributes: the model is broken and animated > -With all the attributes: the model is correct but there is no > animtion. > > Can anyone help me through this ? > Is this behavior normal? > > I also get a lot of Warning: detected OpenGL error 'invalid value' > after RenderBin::draw() > > Thank you for your time and sorry for the long post. > > , > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
