Hello dear osg masters,
I am not very expirienced yet with osg and trying to do a simple example of
projection a texture on another texture, but somehow it is not working, seems
that some settings are wrong. Could you please have a look at the code:
osg::Geode* geode = new osg::Geode;
// set up the texture of the base.
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0, texture,
osg::StateAttribute::ON);
}
geode->setStateSet(stateset);
osg::HeightField* grid = new osg::HeightField;
...
geode->addDrawable(new osg::ShapeDrawable(grid));
osg::TexEnv *texenv = new osg::TexEnv;
texenv->setMode(osg::TexEnv::DECAL);
int tex_width = 1024;
int tex_height = 1024;
//Geometry which has to be projected
osg::Geode* geode2 = new osg::Geode;
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
vertices->push_back(center);
vertices->push_back(osg::Vec3(center.x(), center.y() + 10, center.z()));
vertices->push_back(osg::Vec3(center.x() + 10, center.y() + 10,
center.z()));
vertices->push_back(osg::Vec3(center.x() + 10, center.y(), center.z()));
osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f));//red
osg::ref_ptr<osg::Geometry> quad = new osg::Geometry;
quad->setVertexArray(vertices.get());
quad->setNormalArray(normals.get());
quad->setNormalBinding(osg::Geometry::BIND_OVERALL);
quad->setColorArray(colors.get());
quad->setColorBinding(osg::Geometry::BIND_OVERALL);
quad->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
geode2->addDrawable(quad.get());
osg::Texture2D* texture2 = new osg::Texture2D;
texture2->setTextureSize(tex_width, tex_height);
texture2->setInternalFormat(GL_RGBA);
texture2->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture2->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
stateset->setTextureAttributeAndModes(1, texture2,
osg::StateAttribute::ON);
stateset->setTextureAttribute(0, texenv);
stateset->setTextureAttribute(1, texenv);
osg::Camera* camera = new osg::Camera;
float znear = 10;
float zfar = 30;
float proj_top = 0.25f*znear;
float proj_right = 0.5f*znear;
camera->setProjectionMatrixAsFrustum(-proj_right, proj_right,
-proj_top, proj_top, znear, zfar);
camera->setViewMatrixAsLookAt(osg::Vec3(0.0f, 0.0f, 0.0f) -
osg::Vec3(0.0f, 2.0f, 0.0f) * 10, osg::Vec3(0.0f, 0.0f, 0.0f), osg::Vec3(0.0f,
0.0f, 1.0f));
camera->setViewport(0, 0, tex_width, tex_height);
//camera->setClearColor(osg::Vec4(1.0f, 1.0f, 1.0f, 0.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
camera->attach(osg::Camera::COLOR_BUFFER, texture2);
camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
camera->addChild(geode2);
osg::Group* group = new osg::Group;
group->addChild(geode);
group->addChild(camera);
Thank you!
Cheers,
Ekaterina
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=70116#70116
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