Am 26.12.2016 um 23:56 schrieb Rômulo Cerqueira:
Hi Sebastian,
Are you planning on using the bump-maps alpha channel, or which alpha do you
plan to use.
I wanna to pass a reflectance value to be multiplied by the normal map (normNormal in
fragment shader) to simulate real situations. For example, a steel cube (e.g. reflectance
= 1.12) should reflect more than a plastic cube (e.g. reflectance = 0.6) for a real
sonar. In this case, I need to pass this "reflectance" value to shader for each
object present in the scene.
Ok, then apply your normal-map and perform your calculation. Pass the
reflectance either as
1) vertex attribute
2) uniform
3) in any fixed-state attribute (e.g. misuse the gl_FrontMaterial (via
osg::Material))
So the simplest way is to add a float-uniform to the object to be
modified and multiply your result with its value.
The osgshaders example shows how to transport these values between the
application and the shader. But this works properly only if you
structure in a way that you can control the individual state-sets.
What kind of input geometries do you use? Are the objects with the different
reflectances models or can one model have multiple parts with different
reflectance values?
Any kind of geometries: cubes, spheres, cones, structures... Initially all
parts of the same object will have an unique reflectance model.
Ok, maybe my question was unclear: How are the parts strucured in terms
of osg-nodes? In case you want to control per-object state you need to
have it separated so it has its own stateset.
Cheers
Sebastian
...
Cheers,
Rômulo[/quote]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69770#69770
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
