Hi
I think you are mixing old and new glsl syntax.
varying is old syntax
attribute is new syntax
you should harmonize your shader (use #version GLSLSVERSION at the begin of
your shader) all will become incremental with compiler errors
PS:
Code:
use the code tag to create expandable code section
Cheers
Bruno Oliveira wrote:
> Hello,
>
>
> I have a point cloud and I need to pass some float attribute. I need one flag
> per vertex, so I am using vertex attribute array.
>
>
> Here's how I do it:
>
>
> osg::Geometry* geom = (...);
>
> osg::ref_ptr vvv(new osg::FloatArray());
>
> for (int i = 0; i < nPoints; i++) vvv->push_back(0.);
>
>
> geom->setVertexAttribArray(20, vvv);
> geom->setVertexAttribBinding(20, osg::Geometry::BIND_PER_VERTEX);
>
>
>
> Then I create a osg::Program and bind the attribute as follows:
>
> m_program->addBindAttribLocation("classif", 20);
>
>
>
>
> And here's my vertex shader that paints the vertices as white if the
> attribute "classif" is > 0.1 and red otherwise:
>
> // Vertex Shader
> "varying vec4 vcolor;n"
> "attribute float classif;n"
> "n"
> "void main()n"
> "{n"
> " vcolor = ((classif > 0.1) ? vec4(1., 1., 1., 1.) :
> vec4(1., 0., 0. ,1.));n"
> " gl_Position = ftransform();n"
> "}n",
>
>
> // Fragment Shader
> "varying vec4 vcolor;n"
> "void main() {n"
> " gl_FragColor = vcolor;n"
> "}"
>
>
>
>
> Now, what happens is that, despite I set all attributes to 0., all the points
> appear as white (i.e. the shader is interpreting the attribute as > 0.1). And
> no matter what values I put on the attributes, the vertices are always
> rendered as white.
>
>
> Any hints on why this is happening?
>
> --
> Post generated by Mail2Forum
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=70563#70563
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