🔒 Locked

[MDX]Lighting problem

Started by Fadiii Jul 7, 2006 at 12:56 PM 1 replies 650+ views

Original Post

Jul 7, 2006 at 12:56 PM

I feel silly,but the ambient light is not working in my scene,and when enabling the directional light I have a dark scene except the main character. Here is the scene with ambient light only.


device.RenderState.Ambient=Color.White;
device.RenderState.Lighting=true;

render result

Here is the scene with directional light enabled


device.Lights[0].Type = LightType.Directional;
device.Lights[0].Direction = new Vector3(0.0f, -1.0f, 1.0f);
device.Lights[0].Diffuse = Color.White;
device.Lights[0].Range = 10000.0f;
device.Lights[0].Enabled = true;

Fadiii

Author

Fadiii

Jul 8, 2006 at 10:22 AM

No posts at all,anyway I solved it, the problem was that I scaled the scene not the character, so the normals of all the meshs affected by this operation and need to be normalized again.
The solution is to use the NormalizeNormal option in render state after transforming the mesh.

device.RenderState.NormalizeNormals=true;

So scaling can affect lighting...

jollyjeffers

245

jollyjeffers

Jul 8, 2006 at 10:36 AM

Quote:
Original post by Fadiii
device.RenderState.NormalizeNormals=true;

So scaling can affect lighting...

Yes, scaling affects normals - for lighting calculations to be correct then normals have to be unit-length. Typically if they're shorter you get dull/darker lighting and if they're longer you get brighter lighting.

Just be careful about the NormalizeNormals state - only use it if you have to, as renormalizing a vector isn't a free operation...

hth
Jack

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.