[osg-users] [osgOcean] 3D model material display error!

Tian Ma tianxiao888 at foxmail.com
Tue Nov 3 20:19:04 PST 2009


Hi Kim:

    Thank you for the useful informations!

    I could understand the "default shader" code a little now. 

    When I apply the   "default shader" to the model, it looks a little bit too shinning and glaring.... Can I weaken the glaring thing?

Regards,

MT



Kim Bale wrote:
> Hi MT,
> 
> If you open boat.3ds in osgviewer you will notice that the model
> itself is white. It doesn't have any textures on it and it's there
> purely as a test case for the collision. But yes the default shader
> has been added to it.
> 
> 
> > Will you please give us a example about how to add a model to the oceanScene to keep what they are?
> > 
> 
> The terrain is an external model that has a custom shader applied to
> it, you can look at that. Alternatively look at the default shader
> source.
> 
> K.
> 
> 
> 
> 2009/11/3 Tian Ma <>:
> 
> > Hi Kim:
> > 
> >   I have downloaded the newest version through SVN, and also compiled the code successfully.
> > 
> >   When I turn on the oceanExample's "testCollision", I found that the "boat.3ds" model is just white, the same situation I met before. Is this what the example just want to show us?
> > 
> >   In the example, you did not add any "shader" to the model. Does this mean that: a default shader was added to the model? But why the model looks just white?
> > 
> >   Will you please give us a example about how to add a model to the oceanScene to keep what they are?
> > 
> > 
> > Regards,
> > 
> > MT
> > 
> > 
> > Kim Bale wrote:
> > 
> > > Hi MT,
> > > 
> > > For the reasons I just gave, you can't add objects to the scene and
> > > have the full compliment of effects without either using the default
> > > shader or using your own shader implementation.
> > > 
> > > Reflections/refractions etc will continue to work since they act on
> > > the ocean surface and not the model. However, other such as glare,
> > > depth of field, light scattering, fogging etc will not as they act on
> > > the models themselves.
> > > 
> > > However, it is pretty straight forward to duplicate a subset of fixed
> > > pipeline functionality within a shader and then add the relevant
> > > osgOcean shader effects to it, you can just copy functions from the
> > > default shader and mix them in with the result of your shader.
> > > 
> > > K.
> > > 
> > > 
> > > 2009/11/2 Tian Ma <>:
> > > 
> > > 
> > > > Hi Jan,Kim:
> > > > 
> > > > Thank you a lot.
> > > > 
> > > >     Kim, does it means that: I can never keep the models looks like what they are before? And I have to program shaders for every loaded models, in order to have reflect or other effects?
> > > > 
> > > >     I want to know that: is there a simple way to make the models just look like what they are?
> > > > 
> > > > 
> > > > 
> > > > Kim Bale wrote:
> > > > 
> > > > 
> > > > > Hi Jan, Tian,
> > > > > 
> > > > > osgOcean uses shaders for pretty much every effect in the scene -
> > > > > fogging, depth of field, glare, lighting etc. If objects that are
> > > > > added to the scene are to look consistent with the ocean effects they
> > > > > will require a shader to be applied that takes into account these
> > > > > effects. This is particularly necessary if the fullscreen effects are
> > > > > used as they require the alpha component of the frame buffer to work.
> > > > > 
> > > > > In order to address this issue, OceanScene will apply a default shader
> > > > > to objects added as children (default_scene.frag & vert) which
> > > > > illustrates how to use the uniforms supplied by osgocean (prefixed
> > > > > osgOcean_* ) in conjunction with your own shader. Since I could not
> > > > > anticipate the many wierd and wonderful ways that shaders can be used
> > > > > it only offers a very basic implementation (1 texture unit, limited
> > > > > phong lighting etc) and should be seen as a shader to customise and
> > > > > build on yourself.
> > > > > 
> > > > > You can override the default shader either by attaching a new program
> > > > > to the object you wish to use in the scene or by using this function
> > > > > in OceanScene:
> > > > > 
> > > > > /** Override the default scene shader for custom shaders.
> > > > > * If custom shaders are required for individual nodes add them
> > > > > before adding to the OceanScene.
> > > > > * Dirties state.
> > > > > */
> > > > > void setDefaultSceneShader( osg::Program* program )
> > > > > {
> > > > > _defaultSceneShader = program;
> > > > > _isDirty = true;
> > > > > }
> > > > > 
> > > > > Alternatively you can turn the default shader off completely with
> > > > > setter in OceanScene.
> > > > > 
> > > > > Regards,
> > > > > 
> > > > > Kim.
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 2009/11/2 Jan Ciger <>:
> > > > > 
> > > > > 
> > > > > 
> > > > > > "Tian Ma" <> wrote:
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > > Hi,
> > > > > > > 
> > > > > > >    When I load a model into the osgOcean scene, the model looks white all
> > > > > > >  over, without any material. Anybody knows why?
> > > > > > > 
> > > > > > > 
> > > > > > > 
> > > > > > 
> > > > > > Yes, I have seen the same thing. I believe that the shaders applied by
> > > > > > osgOcean are responsible and are not passing the the vertex colors along.
> > > > > > I have yet to check the shader code, though.
> > > > > > 
> > > > > > Regards,
> > > > > > 
> > > > > > Jan
> > > > > > 
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> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
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