Hi Grigoriy,
why don't you do the multiply in the shader like you do with gl_vertex?
- Werner -
Am 16.11.2018 um 12:29 schrieb Grigoriy Mylnikov:
> Sorry for delayed reply.
>
> My goal is to open and display .osgt files on android the same way they can
> be opened on desktop. This includes using several lights inside a model, both
> directional and point lights.
>
> I have some progress with writing shaders, but I have troubles with
> understanding OSG states. I've updated osg::Light apply() code to pass light
> position (relative to camera) as uniform:
>
>
> Code:
> void LightShader::apply(osg::State& state) const
> {
> #ifdef OSG_GL_FIXED_FUNCTION_AVAILABLE
> ... // Original code
> #else
> ...
> osg::Vec4 relPos = state.getModelViewMatrix() * _position;
> lightPosUniform.get()->set(relPos);
> ...
> #endif
> }
>
>
>
>
> But it seems that state.getModelViewMatrix() does not gives me valid view
> matrix.
>
> If I could get light position (relative to camera), I can use it in shaders
> like this:
>
>
> Code:
> vec3 APos = vec3(gl_ModelViewMatrix * gl_Vertex);
> ...
> vec3 fromPointToLight = lightPos.xyz - APos;
>
>
>
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=75204#75204
>
>
>
>
>
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