Arrgh! Why won't my surfaces light correctly?

Blitz3D Forums/Blitz3D Programming/Arrgh! Why won't my surfaces light correctly?

Captain Laser (Posted 2004) [#1]

I need help! Can someone please tell me where I'm going wrong here? I'm manually creating surfaces and they seem to be fine, except that I can't get Blitz to understand that I want them to be affected by lights in the scene! I can only see them if I set the AmbientLight values quite high, or if I use EntityFX to turn full-bright on. If I replace the MakeFace call with CreateCube(), then scale the cube to the required size and texture it, it works okay. So what am I missing? ;------------ Graphics3D 640, 480, 0, 2 SetBuffer BackBuffer() camera = CreateCamera() PositionEntity camera, 0, 0, -10 light=CreateLight() RotateEntity light, 75, 0, 0 Global tex = LoadTexture("texture.bmp") b = MakeFace(4, 5) While Not KeyHit(1) TurnEntity b, .5, 0, 1 UpdateWorld RenderWorld Flip Wend End Function MakeFace(h#, w#) mesh = CreateMesh() brush = CreateBrush() BrushTexture brush, tex surf = CreateSurface(mesh, brush) v0 = AddVertex (surf, -w, h, 0, 0, 0 ) v1 = AddVertex (surf, -w, -h, 0, 0, 1 ) v2 = AddVertex (surf, w, -h, 0, 1, 1 ) v3 = AddVertex (surf, w, h, 0, 1, 0 ) tri = AddTriangle (surf, v0, v3, v2) tri = AddTriangle (surf, v0, v2, v1) Return mesh End Function; MakeFace ;---------

big10p (Posted 2004) [#2]

You've forgotten to set the vertex normals when building the mesh. Use the VertexNormal() command to set them manually. I don't think you'll be able to simply use UpdateNormals as it will probably smooth the normals at the edge of the mesh. [edit] Actually, using UpdateNormals should be fine.

jfk EO-11110 (Posted 2004) [#3]

use UpdateNOrmals(mesh) before you return

Captain Laser (Posted 2004) [#4]

Ahhh! Normals! Thank you, guys! I KNEW there was something rather simple; turned out the rather simple thing was me! I used UpdateNormals(mesh) and it does the job perfectly; though for the future I will bear in mind big10p's note about it smoothing the normals at the edge. When I am Emperor of All Earth (any day now), you will both be on the "Good" list! -- Mike (AKA Captain Laser)