Hi,
I'm trying to implement a bump mapping shader. That works well for a simple
shape like that plane, where I define the tangent attribute manually:
Code:
Geometry* plane = new Geometry();
Vec3Array* vertices = new Vec3Array();
Vec3Array* normals = new Vec3Array();
DrawElementsUInt* faces = new DrawElementsUInt(PrimitiveSet::TRIANGLES,
0);
Vec3Array* texcoords = new Vec3Array();
Vec3Array* tangents = new Vec3Array();
vertices->push_back(Vec3f(1.0f, 0.0f, 1.0f));
vertices->push_back(Vec3f(-1.0f, 0.0f, 1.0f));
vertices->push_back(Vec3f(1.0f, 0.0f, -1.0f));
vertices->push_back(Vec3f(-1.0f, 0.0f, -1.0f));
normals->push_back(Vec3f(0.0f, -1.0f, 0.0f));
texcoords->push_back(Vec3f(1.0f, 1.0f, 1.0f));
texcoords->push_back(Vec3f(0.0f, 1.0f, 1.0f));
texcoords->push_back(Vec3f(1.0f, 0.0f, 1.0f));
texcoords->push_back(Vec3f(0.0f, 0.0f, 1.0f));
faces->push_back(0);
faces->push_back(1);
faces->push_back(3);
faces->push_back(3);
faces->push_back(2);
faces->push_back(0);
tangents->push_back(Vec3(-1,0,0));
plane->setVertexArray(vertices);
plane->setNormalArray(normals);
plane->setTexCoordArray(0, texcoords);
plane->addPrimitiveSet(faces);
plane->setNormalBinding(Geometry::BIND_OVERALL);
plane->setVertexAttribData(6, Geometry::ArrayData(tangents,
Geometry::BIND_OVERALL));
But for more complex shapes I have to use the TangentGenerator. When I try to
run this:
Code:
ref_ptr<osgUtil::TangentSpaceGenerator> tsg = new
osgUtil::TangentSpaceGenerator();
tsg->generate(plane, 0);
I get an "Debug Assertion Failed" with "Expression: vector subscript out of
range" in generate().
Did I forget something? I cannot see the fault.
Daniel
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=35575#35575
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