[SOLVED] Cel Shading Failures

[jblovloss]

I solved the issue I originally wrote about in here, which essentially was: How do you cel shade with your own texture image? The answer: material texture passes and depth bias!

Here is the code for a material using blender's own cel shading cg program while also using your very own texture, instead of manually coloring it in material by material as the example program does.

Code: Select all

// -------------------------------
// Cel Shading Section, so we can use Ogre's CelShading tools. You probably have to delete  the original ones in the materials/programs
// folder or you will have the same thing defined twice. Or just rename them(?)
// -------------------------------
vertex_program Ogre/CelShadingVP cg
{
	source Example_CelShading.cg
	entry_point main_vp
	profiles vs_1_1 arbvp1

	default_params
	{
		param_named_auto lightPosition light_position_object_space 0
		param_named_auto eyePosition camera_position_object_space
		param_named_auto worldViewProj worldviewproj_matrix
		param_named shininess float 10 
	}
}
fragment_program Ogre/CelShadingFP cg
{
	source Example_CelShading.cg
	entry_point main_fp
	profiles ps_1_1 arbfp1 fp20
}

// Here we go
material my_material
{
	technique
	{
                // This pass draws your texture on with absolutely no shading, so that its just the texture, plain and simple.
		pass
		{
			lighting off
			shading flat

			texture_unit
			{
				texture chord_texture.tga
				tex_coord_set 0
				filtering trilinear
			}
		}

                // This pass does the magic: it draws cel shading on TOP of the texture
		pass
		{
                        // This will keep things looking nice.
			depth_bias 16

                       // Everything below is from the example
			vertex_program_ref Ogre/CelShadingVP
			{
				// map shininess from custom renderable param 1
				param_named_auto shininess custom 1
			}
			fragment_program_ref Ogre/CelShadingFP
			{
				// map diffuse from custom renderable param 2
				param_named_auto diffuse custom 2
				// map specular from custom renderable param 2
				param_named_auto specular custom 3
			}
			texture_unit
			{
				texture cel_shading_diffuse.png 1d
				tex_address_mode clamp
                                filtering none
			}
			texture_unit
			{
				texture cel_shading_specular.png 1d
				tex_address_mode clamp
                                filtering none
			}
			texture_unit
			{
				texture cel_shading_edge.png 1d
				tex_address_mode clamp
                                filtering none
			}

                        // Dont forget to modulate so the two passes will blend!
			scene_blend modulate
		}
        }
}

I also discovered that if your mesh references a material, its not enough since you cannot set the parameters that way. So somewhere in your code, you need to apply your material back to the mesh and set the parameters. Here is how I did it:

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void TutorialApplication::createScene(void)
{
	Ogre::Light* light = mSceneMgr->createLight();
	light->setPosition(20, 40, -50);

	Ogre::Entity* ent = mSceneMgr->createEntity("Mesh", "Mesh.mesh");
	ent->getSubEntity(1)->setMaterialName("chord_body_mat"); // subentity of 1 is the material i want, is mesh specific.
	mSceneMgr->getRootSceneNode()->attachObject(ent);

	Ogre::SubEntity* sub = ent->getSubEntity(1); 
        sub->setCustomParameter(1, Ogre::Vector4(35, 0, 0, 0)); // Shininess
        sub->setCustomParameter(2, Ogre::Vector4(1, 1, 1, 1));   // Diffuse
        sub->setCustomParameter(3, Ogre::Vector4(1, 1, 1, 1));   // Specular
}

The result is uploaded. Post if you have any questions. I think this is very useful knowledge since it took a lot of scrapping aorund to uncover.