Re: [Opensg-users] Texturizing Point Sprites - How to?

[Thomas B. <tho...@rw...>]

Hi,

AFAIK you don't need texture coordinates with point sprites!
Have a look at Source/System/State/testPointChunkRender.cpp
Perhaps a lighting issue?

Thomas 

> -----Original Message-----
> From: ope...@li... 
> [mailto:ope...@li...] On Behalf 
> Of Matthias Stiller
> Sent: Tuesday, March 13, 2007 9:36 AM
> To: ope...@li...
> Subject: Re: [Opensg-users] Texturizing Point Sprites - How to?
> 
> Hello,
> 
> I see no mention of TextureCoordinates, do you supply them 
> with your geometry ?
> 
> Regards
> 
> Matthias
> 
> On Monday 12 March 2007 15:40, Martin Pfeiffer wrote:
> > Hello,
> >  perhaps anyone can help me with the texturizing of my 
> point sprites.
> > - what is wrong?
> >
> >  To have a single textured Point Sprite i tried this here:
> >
> >  1. i defined a TextureChunkPtr, loaded a texture, set it per 
> > ...->setPointSprite(bool b) true  2. i defined a 
> BlendChunkPtr, gave 
> > properties  3. i defined a PointChunkPtr, set it per 
> > ...->setSprite(bool b) true  4. i created a ChunkMaterialPtr, to 
> > bundle the properties  5. i defined a GeometryPtr with: 
> > GeoPTypesPtr(GL_POINT), GeoPLengthsPtr(1), 
> GeoPositions3fPtr(x,y,z)  
> > 6. i created a NodePtr, set the core with the given geometry
> >
> >  In the result i have a black square with no texture.
> >   - why is that so? have i forgotten something?
> >   - is it at all possible to texturize point sprites?
> >
> >
> >         would be nice, if anybody helped - thanx - MartiN
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >  Here is the code:
> >
> >  /*###########################################################*/
> >
> >         ImagePtr image = Image::create(); // material
> >         image->read("textures/dummy_tex.tga");
> >         TextureChunkPtr texChunk = TextureChunk::create();
> >         beginEditCP(texChunk);
> >         {
> >                 texChunk->setEnvMode(GL_MODULATE);
> >                 texChunk->setMinFilter(GL_LINEAR_MIPMAP_LINEAR);
> >                 texChunk->setMagFilter(GL_LINEAR);
> >                 texChunk->setScale(true);
> >                 texChunk->setImage(image);
> >                 texChunk->setPointSprite(true);
> >         }
> >         endEditCP(texChunk);
> >
> >         BlendChunkPtr blendChunk = BlendChunk::create();
> >         beginEditCP(blendChunk);
> >         {
> >                 blendChunk->setAlphaValue(0.2f);
> >                 blendChunk->setAlphaFunc (GL_GEQUAL);
> >                 blendChunk->setSrcFactor (GL_SRC_ALPHA);
> >                 blendChunk->setDestFactor(GL_ONE_MINUS_SRC_ALPHA);
> >         }
> >         endEditCP(blendChunk);
> >
> >         PointChunkPtr pointChunk = PointChunk::create();
> >         beginEditCP(pointChunk);
> >                 pointChunk->setSprite(true);
> >                 pointChunk->setSize(100);
> >         endEditCP(pointChunk);
> >
> >         ChunkMaterialPtr material = ChunkMaterial::create();
> >         beginEditCP(material);
> >                 material->addChunk(pointChunk);
> >                 material->addChunk(texChunk);
> >                 material->addChunk(blendChunk);
> >         endEditCP(material);
> >
> >         GeoPTypesPtr type  = GeoPTypesUI8::create(); // geo
> >         GeoPLengthsPtr length   = GeoPLengthsUI32::create();
> >         GeoPositions3fPtr pos_sprite = GeoPositions3f::create();
> >
> >         beginEditCP(pos_sprite);
> >                 pos_sprite->addValue(Pnt3f( 1000 , 1000 ,1000 ));
> >         endEditCP(pos_sprite);
> >
> >         beginEditCP(type);
> >                 type->addValue(GL_POINT);
> >         endEditCP(type);
> >
> >         beginEditCP(length);
> >                 length->addValue(pos_sprite->getSize());
> >         endEditCP(length);
> >
> >         GeometryPtr spriteGeo = Geometry::create();
> >         beginEditCP(spriteGeo);
> >         {
> >                 spriteGeo->setTypes(type);
> >                 spriteGeo->setLengths(length);
> >                 spriteGeo->setPositions(pos_sprite);
> >                 spriteGeo->setMaterial(material);
> >         }
> >         endEditCP(spriteGeo);
> >
> >         // ... add node to the scene
> >
> >  /*###########################################################*/
> 
> -- 
> +---------------------+----------------------------+
> | VREC GmbH           |                            |
> | Matthias Stiller    |                            |
> | Robert-Bosch-Str. 7 | tel:    +49 6151 4921034   |
> | 64293 Darmstadt     | web:    http://www.vrec.de |
> | Germany             | mail:   ms...@vr...         |
> +---------------------+----------------------------+
> 
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