Irrlicht Engine

Posted: **Wed May 21, 2008 1:58 pm**

Hello,
It's horrible to fail on such a ridiculous problem.
I have 1 MeshSceneNode that has some material properties specified, including SpecularColor. It works.

Then, I draw some triangles with this code :

Code: Select all

	SMaterial mate;
	mate.SpecularColor = SColor(0x0);
	driver->setMaterial(mate);	

	driver->drawIndexedTriangleList(
		&gbverts[0], nverts,
		&gbindices[0],  ntris);

Guess what : the triangles have the same SpecularColor that my MeshSceneNode.
All the others flags and material properties are ok, except SpecularColor.
If I write :

Code: Select all

	SMaterial mate;
	mate.SpecularColor = SColor(0x0);
	mate.Wireframe = true;
	mate.DiffuseColor = SColor(0xff00ff00);
	driver->setMaterial(mate);

Please believe that they are displayed in wireframe, with the right diffuse color..... but the wrong specular color (ie : the MeshSceneNode specular color).

Does someone know what is wrong here ?
I'm using the 1.4 release

Posted: **Wed May 21, 2008 3:58 pm**

I did come across some similar problem (may be it was right the same one) when doing some tests. Unfortunately I did not payed too much attention to it back then so I do not have that code anymore. It was 1.4 too.

Posted: **Wed May 21, 2008 4:35 pm**

An important information would be the driver used...

Posted: **Fri May 23, 2008 6:55 am**

Code: Select all

Irrlicht Engine version 1.4
Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Using renderer: OpenGL 2.1.1
Quadro FX 360M/PCI/SSE2: NVIDIA Corporation
OpenGL driver version is 1.2 or better.
GLSL version: 1.3

Posted: **Fri May 23, 2008 7:32 am**

Ok, I guess it's a problem with the still not properly used specular color model in the opengl driver. I'll move this thread to bugs forum - I already filed a topic on my development todos month ago, but did not get to working on this issue, yet.
Maybe someone could tell me a proper way of enabling specular colors with and without the separate sepcular color extension. Maybe setting it to zero in the else case would help already?!

Posted: **Mon May 26, 2008 6:02 pm**

I'm not a OpenGL specialist. But, as far as I know, to enable and disable the specular color extension you have to use glEnable and glDiable over GL_COLOR_SUM_EXT.

I think that changing GL_LIGHT_MODEL_COLOR_CONTROL_EXT should allow using specular color without the extension itself.

By the way. Wasn't the specular color extension already integrated into the OpenGL Core in version 1.2?

Irrlicht Engine

Can't use SpecularColor properly

Can't use SpecularColor properly