Carsten Neumann wrote: > > (i) PNG RGBA texture > > http://mauroport.netsons.org/magazzino/temp/alpha_texture.png > > this one shows the limitation of sorting only objects not triangles. The > bottom face of the cube is rendered after the front and left faces and > with setTransZWrite(false) (the default) the bottom overdraws the front > and left faces. For cases like this you probably want to enable depth > writes and/or experiment with alpha testing (see > BlendChunk::setAlphaFunc and BlendChunk::setAlphaValue). You could split > the cube into more than one geometry, but for any scene of interesting > size this is not really feasible for performance reasons. > The real solution to rendering transparent objects correctly is to apply > some for or another of depth peeling. > > > (ii) Diffuse color with alpha=1.0 > > http://mauroport.netsons.org/magazzino/temp/color.png > > hm, here I'm not so sure what the problem is. It looks as if the cube is > missing the face that is oriented towards the bottom left. Is this done > with lighting enabled? Are the normals on the cube correct? I'm not sure > why the face oriented towards the bottom right is black - I'd suspect it > is a back face that is not lit?
I had forgot to add a DepthChunk, in 1.8 wasn't necessary. My fault. Now I have this code: ract = OSG::RenderAction::create(); ract->setZWriteTrans(true); sceneManager->setAction(ract); // [...] chunkMaterial->addChunk(depthChunk); // [...] blendChunk->setSrcFactor(GL_SRC_ALPHA); blendChunk->setAlphaFunc(GL_GREATER); // <-- Thank you for this! Works fine blendChunk->setAlphaValue(0.1f); blendChunk->setDestFactor(GL_ONE_MINUS_SRC_ALPHA); chunkMaterial->addChunk(blendChunk); Both (i) and (ii) work like a charm. New screenshots: http://mauroport.netsons.org/magazzino/temp/alpha_texture2.png http://mauroport.netsons.org/magazzino/temp/color2.png Thank you, -- Mauro ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
