mp3butcher wrote:
I haven't noticed the introduction of osgVolume::VolumeScene.
It's a great feature.
But At first glance, it seams to use an other mecanism than osg::view slave
camera in order to copy matmodelview and matproj to the RTT camera...seams
managed via uniforms in programs
Further it seams to use a program (volume_color_depth.frag) in order to copy
back texture stored color/depth to the framebuffer.
So it bring me to the question: What is the best?:
1)use Render to Texture and copy back with a fragment program
2)use Render to renderbuffer and glBlitFrameBuffer to copyback
(
To return to my code:
i've to set camrea graphic context (i'm dumb) and disable nearfarcomputation
And i put the blit on the maincamera predraw
And i put the _camera as pre_render
I will post a nicer/cleaner code tomorrow to have your opinion
The results is good as long as I rotate the maincamera but when translate it,
there's artifacts due to znear/zfar discordance..will see this bug later
)
robertosfield wrote:
Hi Julien,
I am away from my computer so can't look at you whole post. You description
it sound rather like the osgVolume::MultiPassTechnique now part of The
svn/trunk version of the Osg.
Robert On 28 Nov 2014 19:50, Julien Valentin () wrote:
Hi,
In the frame of mixed geometry/volume rendering, i would like to create
depthtexture for a subgraph..this texture is used to stop forward raycast
of the volume.
In order to do that i would like to:
1)Render subgraph in a fbo with 3 attachements
-depth to renderbuffer
-depth to texture
-color to renderbuffer
2)Copy back depth and color render buffers from the fbo to the frame
buffer (using glblitframebuffer)
Here my current code
Code:
class OSGMULTIGRID_EXPORT RenderDepth2Texture : public osg::Group{
public:
virtual bool addChild(osg::Node*n);
RenderDepth2Texture();
/** Copy constructor using CopyOp to manage deep vs
shallow copy.*/
inline osg::Texture2D*getDepthTexture()const{ return
_depthtexture; }
inline osg::Uniform*getDepthResolutionUniform()const{
return _rdx; }
void setRasterizationResolution(const osg::Vec2ui);
const osg::Vec2ui getRasterizationResolution()const {
return _resolution; }
virtual void traverse(osg::NodeVisitor nv);
osg::ref_ptrosg::Texture2D _depthtexture,_colortexture;
osg::Vec2ui _resolution;
osg::ref_ptrosg::Camera _camera;
osg::ref_ptrosg::Uniform _rdx;
};
class PreDrawFBOCallback : public osg::Camera::DrawCallback
{
public:
PreDrawFBOCallback(osg::FrameBufferObject* fbo,
osg::FrameBufferObject* source_fbo, unsigned int width, unsigned int
height, osg::Texture2D *dt, osg::Texture2D *ct) :
_fbo(fbo), _source_fbo(source_fbo), _depthTexture(dt),
_colorTexture(ct), _width(width), _height(height) {}
virtual void operator () (osg::RenderInfo renderInfo) const
{
cerr PreDrawFBOCallback endl;
// switching only the frame buffer attachments is
actually faster than switching the framebuffer
#ifdef USE_PACKED_DEPTH_STENCIL
#ifdef USE_TEXTURE_RECTANGLE
_fbo-setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
osg::FrameBufferAttachment((osg::TextureRectangle*)(_depthTexture.get(;
#else
_fbo-setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
osg::FrameBufferAttachment((osg::Texture2D*)(_depthTexture.get(;
_fbo-setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
GL_DEPTH24_STENCIL8_EXT)));// A16)));
#endif
#else
#ifdef USE_TEXTURE_RECTANGLE
_fbo-setAttachment(osg::Camera::DEPTH_BUFFER,
osg::FrameBufferAttachment((osg::TextureRectangle*)(_depthTexture.get(;
#else
_fbo-setAttachment(osg::Camera::DEPTH_BUFFER,
osg::FrameBufferAttachment(_depthTexture.get()));//
osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
GL_RGBA16)));
#endif
#endif
#ifdef USE_TEXTURE_RECTANGLE
_fbo-setAttachment(osg::Camera::COLOR_BUFFER0,
osg::FrameBufferAttachment((osg::TextureRectangle*)(_colorTexture.get(;
#else
_fbo-setAttachment(osg::Camera::COLOR_BUFFER0,
osg::FrameBufferAttachment((_colorTexture.get(;//
osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
GL_DEPTH_COMPONENT16_ARB)));
_fbo-setAttachment(osg::Camera::COLOR_BUFFER,
osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
