Hi Patrik,
Simply attach the code (probably compress it with zip) so others might
check on this too.
Hi Sebastian,
I have dig down and find the resolution of the OpenGL error, I passed
an int or double instead of a float into the shader. There is
something strange with how I assign the texture, I rewrote it as
[code]
osg::Uniform* specEnvMap = new
osg::Uniform(osg::Uniform::SAMPLER_CUBE,"SpecularEnvMap");
specEnvMap->set(tex);
osg::Uniform* diffEnvMap = new
osg::Uniform(osg::Uniform::SAMPLER_CUBE, "DiffuseEnvMap");
diffEnvMap->set(tex);
[/code]
To make sure that it is of type sampleCube.
I could upload all code, since I'm trying to write a minimal program
which demonstrates Image Based Lighting. It is two files, one header
and one cpp, in total 170 lines. Would that be of any help?
kind regards
Patrik
On Tue, May 13, 2014 at 11:04 AM, Sebastian Messerschmidt
<[email protected]
<mailto:[email protected]>> wrote:
Hi Patrik,
Okay, I've digged a bit deeper into your code. Somehow your code
to add the textures seems awkward. You are assigning the cubemap
to the first texture unit and create 3 uniforms to texture unit 0.
It is hard to tell what is going wrong on your side, given that
small piece of code, but since you get an OpenGL error you should
chase it down. It might be related to binding the texture to
multiple sampler objects on the same texture unit. Try to step
back and bind the cubemap to a simple program with exactly one
cubemap sampler and do some debugging with a simple cubemapping
shader.
There is a osgcubemap example which you could extend to use
shaders (beware that TexGen will not work with shaders, so you
will have to write your own in the vertex shader, which is not
complicated though)
I don't know the specific example you are referring to, so I
cannot really give your more pointers unless you prepare a small
compiling example.
Hi Sebastian,
Yes, that works as well, the sphere is red.
cheers
Patrik
On Tue, May 13, 2014 at 10:32 AM, Sebastian Messerschmidt
<[email protected]
<mailto:[email protected]>> wrote:
Hi Patrik,
Hi Sebastian,
The baseColor is applied to the sphere, so I can see my
shader is in use. No differences when using osgShadow or not.
Yes because it is the first texture unit. Fixed function
pipeline and osgShadow will handle it. Please follwo my
advice and change the output of the fragment shader to
gl_FragColor = vec4(1,0,0,1) or gl_FragData[0] = vec4(1,0,0,1)
to see if it is _really_ your shader.
cheers
Sebastian
Cheers
Patrik
On Tue, May 13, 2014 at 10:03 AM, Sebastian Messerschmidt
<[email protected]
<mailto:[email protected]>> wrote:
Hi Patrick,
from a glimpse it seems you are setting up the shader to
the geode while using osgShadow, which will override
your shaders.
I guess you need to set the shaders at the
shadowTechnique. Could you try it without osgShadow or
simply do some shader debugging by setting the
gl_FragColor to some debug value to see if your shader
is used at all?
cheers
Sebastian
HI,
I'm trying to implement Image Based Lighting in a
scene. but I think I miss something essential.
I have copied the fragment shader and vertex shader
from the orange book, ch 12/Image Based Lighting.
Created a sphere which shall be the emissive surface.
When I run I receive following warning/error msg:
Warning: detected OpenGL error 'invalid operation' at
After Renderer::compile.
The sphere is colored by the base-color, but it is not
emissive. What kind of attributes do I need to set to
get it work, or should I make things in a different
order? See code below.
Kind regards
Patrik
This is the main code:
[code]
osgShadow::ShadowedScene* scene(new
osgShadow::ShadowedScene());
osgShadow::ShadowMap* sm(new osgShadow::ShadowMap());
sm->setTextureSize(osg::Vec2s(512,512));
scene->setShadowTechnique(sm);
osg::Group* root = new osg::Group;
osg::Geode* em = new osg::Geode();
em->addDrawable(new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0,0,0), 10.0) ) );
osg::Geode* geode = new osg::Geode();
geode->addDrawable(new osg::ShapeDrawable( new
osg::Cylinder(osg::Vec3(0,0,-3.0),10,0.2 ) )) ;
geode->setCullingActive(true);
root->addChild(em);
root->addChild(geode);
scene->addChild(root);
osg::TextureCubeMap* tex = readCubeMap();
{
osg::StateSet* ss = em->getOrCreateStateSet();
osg::Program* program = new osg::Program;
program->setName( "IBL" );
program->addShader( new osg::Shader(
osg::Shader::VERTEX, IBLVertSource ) );
program->addShader( new osg::Shader(
osg::Shader::FRAGMENT, IBLFragSource ) );
ss->setAttributeAndModes( program,
osg::StateAttribute::ON );
osg::Uniform* baseColor = new osg::Uniform(
"BaseColor", osg::Vec3(0.2, 0.4, 0.6) );
osg::Uniform* specular = new osg::Uniform(
"SpecularPercent", 0);
osg::Uniform* diffuse = new osg::Uniform(
"DiffusePercent", 1.0);
osg::Uniform* specEnvMap = new
osg::Uniform("SpecularEnvMap", 0);
osg::Uniform* diffEnvMap = new osg::Uniform(
"DiffuseEnvMap", 0);
ss->setTextureAttributeAndModes(0, tex,
osg::StateAttribute::ON );
ss->addUniform( baseColor );
ss->addUniform( specular );
ss->addUniform( diffuse );
ss->addUniform( specEnvMap );
ss->addUniform( diffEnvMap );
}
viewer.setSceneData(scene);
viewer.run();
[/code]
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