Hi
environment-set(cubemap.get());
should be
environment-set(int(unit));
Cheers
27.03.2013, 18:45, Andrea Martini martini.and...@gmail.com:
Hi,
i'm trying to apply a reflection effect on a sphere, using a cube map.
I'm using as vertex shader dthe following :
Code:
#version 400 compatibility
// Orange Book Opengl Shading Language, 2 edition pag. 257
varying vec3 ReflectDir;
varying float LightIntensity;
uniform vec3 LightPos;
void main()
{
gl_Position = ftransform();
vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
vec4 pos = gl_ModelViewMatrix * gl_Vertex;
vec3 eyeDir = pos.xyz;
ReflectDir = reflect(eyeDir, normal);
LightIntensity = max(dot(normalize(LightPos - eyeDir), normal),0.0);
}
and the following fragment:
Code:
#version 400 compatibility
// Orange Book Opengl Shading Language, 2 edition pag. 257
uniform vec3 BaseColor;
uniform float MixRatio;
uniform samplerCube EnvMap;
varying vec3 ReflectDir;
varying float LightIntensity;
void main()
{
// Look up environment map value in cube map
vec3 envColor = vec3(textureCube(EnvMap, ReflectDir));
// Add lighting to base color and mix
vec3 base = LightIntensity * BaseColor;
envColor = mix(envColor, base, MixRatio);
gl_FragColor = vec4(envColor, 1.0);
}
To pass the samplerCube, i use the following osg code :
Code:
osg::Shader* vertexShader = osgDB::readShaderFile(osg::Shader::VERTEX,
\\shaders\\\shaders\\ReflectionCubeMaps\\ReflectionCubeMaps4.vert);
osg::Program* program=new osg::Program();
if (!vertexShader)
{
std::cout No vertex Shader Loaded. std::endl;
return;
}
osg::Shader* fragShader =
osgDB::readShaderFile(osg::Shader::FRAGMENT,
\\shaders\\\shaders\\ReflectionCubeMaps\\ReflectionCubeMaps4.frag);
if (!fragShader)
{
std::cout No fragment Shader Loaded. std::endl;
return;
}
program-addShader(vertexShader);
program-addShader(fragShader);
osg::StateSet* stateset=myModel-getOrCreateStateSet(); // My model
is the SPHERE
osg::ref_ptrosg::TextureCubeMap cubemap = new osg::TextureCubeMap;
/**/
osg::Image* imagePosX =
osgDB::readImageFile(\\Cubemap_snow\\posx.jpg);
osg::Image* imageNegX = osgDB::readImageFile(\\Cubemap_snow\\negx.jpg);
osg::Image* imagePosY = osgDB::readImageFile(\\Cubemap_snow\\posy.jpg);
osg::Image* imageNegY = osgDB::readImageFile(\\Cubemap_snow\\negy.jpg);
osg::Image* imagePosZ = osgDB::readImageFile(\\Cubemap_snow\\posz.jpg);
osg::Image* imageNegZ = osgDB::readImageFile(\\Cubemap_snow\\negz.jpg);
if (imagePosX imageNegX imagePosY imageNegY imagePosZ
imageNegZ)
{
cubemap-setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX);
cubemap-setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX);
cubemap-setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY);
cubemap-setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY);
cubemap-setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ);
cubemap-setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ);
cubemap-setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
cubemap-setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
cubemap-setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
cubemap-setFilter(osg::Texture::MIN_FILTER,
osg::Texture::LINEAR_MIPMAP_LINEAR);
cubemap-setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
cubemap-setResizeNonPowerOfTwoHint( false );
}
stateset-setAttributeAndModes( program, osg::StateAttribute::ON );
stateset-setTextureAttributeAndModes( unit, cubemap.get() );
osg::Uniform* environment = new
osg::Uniform(osg::Uniform::SAMPLER_CUBE, EnvMap);
environment-set(cubemap.get());
stateset-addUniform( environment );
stateset-addUniform(new osg::Uniform(LightPos,osg::Vec3(0.0, 0.0,
4.0)));
stateset-addUniform(new osg::Uniform(BaseColor,osg::Vec3(0.8, 0.2,
1.0)));
stateset-addUniform(new osg::Uniform(MixRatio,0.8f));
What i get, is the cubemap and a violet sphere : the sphere doesn't reflect
the environment.
In the file attached, i report a snapshot of the result.
Please, could you suggest me where i can find the error?
Thank you!
Cheers,
Andrea
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=53341#53341
,
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
___
osg-users mailing list
osg-users@lists.openscenegraph.org
