Hi Rafael,
Resolution of shadow mapping is a well known issue. The best
solutions are to use update the extensions and projection of the
texture on each frame, either using perspective shadow maps or
parallel split shadow maps. Both these techniques are more involved
though. Both I would to see added to the osgShadow library (in 2.x).
Robert.
On 7/26/07, vhsimul vhlab <[EMAIL PROTECTED]> wrote:
>
> hi folks!!
>
> I have a problem with resolution of my depth shadow, in the classic osg
> example, we have the function, createShadowedScene, and whithin it there are
> two variables unsigned int tex_width = 1024; unsigned int tex_height =
> 1024;
>
> theses variables are used to setting up the
>
> osg::Texture2D* texture = new osg::Texture2D;
> texture->setTextureSize(tex_width, tex_height);
>
> osg::CameraNode* camera = new osg::CameraNode;
> camera->setViewport(0,0,tex_width,tex_height);
>
>
> I found a solution for increase my shadow resolution, just change the values
> to 4096, and the shadow resolution getting better so much!
>
> however, when I do it, the projection on the floor of my light is so tight,
> covering just a little part of floor,
>
> whats the possible problem?
>
> thanks guys!
>
> Rafael
>
>
> -----
>
>
>
> osg::Group* createShadowedScene(osg::Node* shadowed,osg::MatrixTransform*
> light_transform, unsigned int unit)
> {
> osg::Group* group = new osg::Group;
>
> unsigned int tex_width = 4096;
> unsigned int tex_height = 4096;
>
> osg::Texture2D* texture = new osg::Texture2D;
> texture->setTextureSize(tex_width, tex_height);
>
> texture->setInternalFormat(GL_DEPTH_COMPONENT);
> texture->setShadowComparison(true);
> texture->setShadowTextureMode(Texture::LUMINANCE);
> texture->setFilter(osg::Texture2D::MIN_FILTER,
> osg::Texture2D::LINEAR);
> texture->setFilter(osg::Texture2D::MAG_FILTER,
> osg::Texture2D::LINEAR);
>
>
> // set up the render to texture camera.
> {
>
> // create the camera
> osg::CameraNode* camera = new osg::CameraNode;
>
> camera->setClearMask(GL_DEPTH_BUFFER_BIT);
>
> camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
>
> camera->setComputeNearFarMode(osg::CameraNode::DO_NOT_COMPUTE_NEAR_FAR);
>
> // set viewport
> camera->setViewport(0,0,tex_width,tex_height);
>
> osg::StateSet* _local_stateset = camera->getOrCreateStateSet();
>
> _local_stateset->setMode(GL_LIGHTING,
> osg::StateAttribute::ON);
>
>
> float factor = 0.0f;
> float units = 1.0f;
>
> ref_ptr<PolygonOffset> polygon_offset = new PolygonOffset;
> polygon_offset->setFactor(factor);
> polygon_offset->setUnits(units);
> _local_stateset->setAttribute(polygon_offset.get(),
> StateAttribute::ON | StateAttribute::OVERRIDE);
> _local_stateset->setMode(GL_POLYGON_OFFSET_FILL,
> StateAttribute::ON | StateAttribute::OVERRIDE);
>
>
> ref_ptr<CullFace> cull_face = new CullFace;
> cull_face->setMode(CullFace::FRONT);
> _local_stateset->setAttribute(cull_face.get(),
> StateAttribute::ON | StateAttribute::OVERRIDE);
> _local_stateset->setMode(GL_CULL_FACE,
> StateAttribute::ON | StateAttribute::OVERRIDE);
>
>
> // set the camera to render before the main camera.
>
> camera->setRenderOrder(osg::CameraNode::PRE_RENDER);
>
> // tell the camera to use OpenGL frame buffer object where
> supported.
>
> camera->setRenderTargetImplementation(osg::CameraNode::FRAME_BUFFER);
>
> // attach the texture and use it as the color buffer.
> camera->attach(osg::CameraNode::DEPTH_BUFFER,
> texture);
>
> // add subgraph to render
> camera->addChild(shadowed);
>
> group->addChild(camera);
>
> // create the texgen node to project the tex coords onto the
> subgraph
> osg::TexGenNode* texgenNode = new osg::TexGenNode;
>
>
> texgenNode->setTextureUnit(unit);
> group->addChild(texgenNode);
>
> // set an update callback to keep moving the camera and tex gen in
> the right direction.
> group->setUpdateCallback(new
> UpdateCameraAndTexGenCallback(light_transform, camera,
> texgenNode));
> }
>
>
> // set the shadowed subgraph so that it uses the texture and tex gen
> settings.
> {
> osg::Group* shadowedGroup = new osg::Group;
> shadowedGroup->addChild(shadowed);
> group->addChild(shadowedGroup);
>
> osg::StateSet* stateset =
> shadowedGroup->getOrCreateStateSet();
>
> stateset->setTextureAttributeAndModes(unit,texture,osg::StateAttribute::ON);
>
> stateset->setTextureMode(unit,GL_TEXTURE_GEN_S,osg::StateAttribute::ON);
>
> stateset->setTextureMode(unit,GL_TEXTURE_GEN_T,osg::StateAttribute::ON);
>
> stateset->setTextureMode(unit,GL_TEXTURE_GEN_R,osg::StateAttribute::ON);
>
>
> stateset->setTextureMode(unit,GL_TEXTURE_GEN_Q,osg::StateAttribute::ON);
>
> osg::Program* program = new osg::Program;
> stateset->setAttribute(program);
>
> if (unit==0)
> {
> osg::Shader* fragment_shader = new
> osg::Shader(osg::Shader::FRAGMENT,
> fragmentShaderSource_noBaseTexture);
> program->addShader(fragment_shader);
>
> osg::Uniform* shadowTextureSampler = new
> osg::Uniform("shadowTexture",(int)unit);
> stateset->addUniform(shadowTextureSampler);
> }
> else
> {
> osg::Shader* fragment_shader = new
> osg::Shader(osg::Shader::FRAGMENT,
> fragmentShaderSource_withBaseTexture);
> program->addShader(fragment_shader);
>
>
> // osg::Uniform* baseTextureSampler = new
> osg::Uniform("baseTexture",1);
> // stateset->addUniform(baseTextureSampler);
>
> osg::Uniform* shadowTextureSampler = new
> osg::Uniform("shadowTexture",(int)unit);
> stateset->addUniform(shadowTextureSampler);
> }
>
> osg::Uniform* ambientBias = new
> osg::Uniform("ambientBias",osg::Vec2( 0.3f,1.2f));
> // osg::Uniform* ambientBias = new
> osg::Uniform("ambientBias",osg::Vec2(0.02f,0.03f));
> stateset->addUniform(ambientBias);
>
> }
>
> // add the shadower and shadowed.
> group->addChild(light_transform);
>
> return group;
> }
>
>
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>
>
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