Hi,
a few things...
On 07/10/10 11:33, Aitor Ardanza wrote:
Frederic Bouvier wrote:
// load texture as an image
imgTexture = osgDB::readImageFile("model/BAKE_OVERRIDE.jpg");
// if the image is successfully loaded
if (imgTexture)
{
imgTexture->allocateImage(3500, 3500, 1, GL_RGBA,
GL_UNSIGNED_BYTE);
Why are you reallocating space for an image loaded from file ?
Shouldn't the texture dimension be a power of 2 ?
Ok, it is a mistake. The model I load (obj) has linked a texture that is loaded
automatically.
I want to paint in another texture (size like models texture) in fragment
shader....
I am following the example of osgMultiplerendertargets ... but I can not get
good textures ...
Code:
osg::Group *scene = new osg::Group();
modelTransf = new osg::PositionAttitudeTransform();
node = osgDB::readNodeFile("model\\file.obj");
node->setName("AVATAR");
modelTransf->addChild(node);
scene->addChild(modelTransf);
setSceneData(scene);
unsigned tex_width = 4096;
unsigned tex_height = 4096;
// textures to render to and to use for texturing of the final quad
osg::TextureRectangle* textureRect[2] = {0,0};
for (int i=0;i<2;i++) {
textureRect[i] = new osg::TextureRectangle;
textureRect[i]->setTextureSize(tex_width, tex_height);
textureRect[i]->setInternalFormat(GL_RGBA);
textureRect[i]->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
textureRect[i]->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
}
//create the geometry of the quad
{
osg::Geometry* polyGeom = new osg::Geometry();
polyGeom->setSupportsDisplayList(false);
osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec2Array* texcoords = new osg::Vec2Array;
vertices->push_back(osg::Vec3d(0,0,0));
texcoords->push_back(osg::Vec2(0,0));
vertices->push_back(osg::Vec3d(200,0,0));
texcoords->push_back(osg::Vec2(tex_width,0));
vertices->push_back(osg::Vec3d(200,0,200));
texcoords->push_back(osg::Vec2(tex_width,tex_height));
vertices->push_back(osg::Vec3d(0,0,200));
texcoords->push_back(osg::Vec2(0,tex_height));
What's the magic 200's doing? If your RTT camera's projection is gonna
be from 0 to 1, make it 1. Also, if the RTT camera is going to use
identity for its view matrix, you have to draw the quad in the XY-plane,
not XZ.
polyGeom->setVertexArray(vertices);
polyGeom->setTexCoordArray(0,texcoords);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::QUADS,0,vertices->size()));
// now we need to add the textures (generated by RTT) to the Drawable.
osg::StateSet* stateset = new osg::StateSet;
for (int i=0;i<2;i++) {
stateset->setTextureAttributeAndModes(i, textureRect[i],
osg::StateAttribute::ON);
}
polyGeom->setStateSet(stateset);
static const char *shaderSource = {
"uniform sampler2DRect textureID0;\n"
"uniform sampler2DRect textureID1;\n"
"void main(void)\n"
"{\n"
" gl_FragData[0] = \n"
" vec4(texture2DRect( textureID0, gl_TexCoord[0].st ).rgb,
1); \n"
"}\n"
};
osg::ref_ptr<osg::Shader> fshader = new osg::Shader(
osg::Shader::FRAGMENT , shaderSource);
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader( fshader.get());
stateset->setAttributeAndModes( program.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
stateset->addUniform(new osg::Uniform("textureID0", 0));
stateset->addUniform(new osg::Uniform("textureID1", 1));
osg::Geode* geode = new osg::Geode();
geode->addDrawable(polyGeom);
scene->addChild(geode);
}
getCamera()->setViewport(new osg::Viewport(0,0,width(),height()));
getCamera()->setProjectionMatrixAsPerspective(30.0f,
static_cast<double>(width())/static_cast<double>(height()), 1.0f,
10000.0f);
getCamera()->setGraphicsContext(getGraphicsWindow());
// now create the camera to do the multiple render to texture
{
osg::Camera* camera = new osg::Camera;
// set up the background color and clear mask.
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// the camera is going to look at our input quad
camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1,0,1));
yes, but your quad is not 1x1 it's 200x200.
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrix(osg::Matrix::identity());
yes, but your quad is in die XZ plane. Identity transform means the
camera is looking in -Z direction with X-right and Y-up.
// set viewport
camera->setViewport(0, 0, width(), height());
this is fine, should match your output texture size.
cheers
jp
// set the camera to render before the main camera.
camera->setRenderOrder(osg::Camera::PRE_RENDER);
// tell the camera to use OpenGL frame buffer objects
//camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
// attach the textures to use
for (int i=0;i<2;i++) {
camera->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0+i),
textureRect[i]);
}
// add the subgraph to render
camera->addChild(node);
scene->addChild(camera);
}
and fragment shader of model node:
Code:
uniform sampler2D baseMap;
uniform vec3 interPos;
varying vec3 Normal;
varying vec4 color;
varying vec2 Texcoord;
varying vec3 position;
void main( void )
{
float radio = 3.0;
vec3 a = position - interPos;
float dist = sqrt((a.x*a.x)+(a.y*a.y)+(a.z*a.z));
vec4 paintColor = vec4(1.0,0.0,0.0,1.0);
if(dist<radio){
gl_FragData[0] = texture2D( baseMap, Texcoord ) * color + paintColor;
gl_FragData[1] = paintColor;
}
else{
gl_FragData[0] = texture2D( baseMap, Texcoord ) * color;
gl_FragData[1] = paintColor;
}
}
Assuming that in the shader of quad I put: vec4(texture2DRect( textureID1,
gl_TexCoord[0].st ).rgb, 1);
it should give me a red texture, but its black...
Thanks for de answer!
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=32518#32518
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