I’ve almost implemented cel shading using a vertex program. And while I am pleased with the results, when I applied a model outline, I lost all the nice cel shaded lighting. To better explain my issue, see the rendering and code snippet below:
The knight closest to the center has nice cel shading and lighting.
The knight near the bottom edge has the outline applied and has lost all nice cel shading.
/* Stencil one set of the checked tiles. */
...
/* Render the Reflections. */
...
/* Stencil all tiles. */
...
/* Render the checked floor. */
...
/* Render the shadows. */
...
...
/* Use the inverse model matrix to convert light position into model space. */
vector_ model_space_light_position = inverse_model_matrix * light_position;
/* Render the chess pieces. */
glBindTexture(GL_TEXTURE_1D, cel_brightness);
glEnable(GL_TEXTURE_1D);
glColor4f(0.75f, 0.95f, 1.0f, 1.0f);
vp->Bind();
vp->Enable();
vp->EnvParameter(0, model_space_light_position[x], model_space_light_position[y], model_space_light_position[z], model_space_light_position[w]);
RenderKnight(knight_x1, knight_z1, false);
RenderKnight(knight_x2, knight_z2, true);
glDisable(GL_TEXTURE_1D);
/* Outline the model. */
glLineWidth(3.0f);
glCullFace(GL_FRONT);
glColor4f(0.0f, 0.0f, 0.0f, 0.0f);
glPolygonMode(GL_BACK, GL_LINE);
RenderKnight(knight_x1, knight_z1, false);
glPolygonMode(GL_BACK, GL_FILL);
glCullFace(GL_BACK);
vp->Disable();
...
Any ideas?
If you require more code or additional information to resolve the issue, just ask.
Thanks in advance.
[Edited by - sjf on January 21, 2006 4:27:34 PM]
