Game Runs Slow

I have a nice little terrain, and a little player (.b3d animation) and a skybox. I made my skybox useing a modified version of the function in the "Castle" sample by mak. But, when I run the program without the skybox, it runs at about 45 fps. When I run it with the skybox, it runs at 3 or 4 fps, but only when I am in view of a corner, when I'm not, it runs at about 40. Whats going on?

You have discovered gremlins in your PC's inner space, and they are eating your CPU cycles. You must debug them!

Meanwhile back on planet earth, can you post some code?

Well, yeah, that too.

This is what I'm using as the skybox

 
Global Sky = loadskybox()
EntityOrder sky,10

Then in the main loop

PositionEntity sky,EntityX(player\mesh),Entity(player\mesh),EntityZ(player\mesh)

The LoadSkyBox Function taken from Castle sample

Function LoadSkyBox()
	m=CreateMesh()
	;front face
	b=LoadBrush("media\terrain\front.jpg",49 )
	s=CreateSurface( m,b )
	AddVertex s,-1,+1,-1,0,0:AddVertex s,+1,+1,-1,1,0
	AddVertex s,+1,-1,-1,1,1:AddVertex s,-1,-1,-1,0,1
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	;right face
	b=LoadBrush("media\terrain\right.jpg",49 )
	s=CreateSurface( m,b )
	AddVertex s,+1,+1,-1,0,0:AddVertex s,+1,+1,+1,1,0
	AddVertex s,+1,-1,+1,1,1:AddVertex s,+1,-1,-1,0,1
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	;back face
	b=LoadBrush("media\terrain\back.jpg",49 )
	s=CreateSurface( m,b )
	AddVertex s,+1,+1,+1,0,0:AddVertex s,-1,+1,+1,1,0
	AddVertex s,-1,-1,+1,1,1:AddVertex s,+1,-1,+1,0,1
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	;left face
	b=LoadBrush("media\terrain\left.jpg",49 )
	s=CreateSurface( m,b )
	AddVertex s,-1,+1,+1,0,0:AddVertex s,-1,+1,-1,1,0
	AddVertex s,-1,-1,-1,1,1:AddVertex s,-1,-1,+1,0,1
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	;top face
	b=LoadBrush("media\terrain\up.jpg",49 )
	s=CreateSurface( m,b )
	AddVertex s,-1,+1,+1,0,1:AddVertex s,+1,+1,+1,0,0
	AddVertex s,+1,+1,-1,1,0:AddVertex s,-1,+1,-1,1,1
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	;bottom face	
	b=LoadBrush("media\terrain\sky.png",49 )
	s=CreateSurface( m,b )
	AddVertex s,-1,-1,-1,1,0:AddVertex s,+1,-1,-1,1,1
	AddVertex s,+1,-1,+1,0,1:AddVertex s,-1,-1,+1,0,0
	AddTriangle s,0,1,2:AddTriangle s,0,2,3
	FreeBrush b
	ScaleMesh m,100,100,100
	FlipMesh m
	EntityFX m,1
	Return m
End Function

did you call the func in the main cycle?
if yes, you have to call it out of the main cycle...
ex:

global a = 0
while not a > 20
 LoadSkyBox()
 a = a + 1
wend

You'll have about 20 skies...

global a = 0
LoadSkyBox()
while not a >20
 a = a + 1
wend

You'll have one sky

Thanks everyone, it turned out I was useing to big a picture for the brushes.

would there be a way to make a skybox without brushes?

Gobbo - create your skybox in a 3d app as a cube, texture the insides and invert the normals, then simply load the object, and treat as a normal skybox cube.

how do i "invert the normals" :) ?

The flipmesh command in b3d will invert the normals. Alternatively most 3d apps you can do the same although I might go by different names.

im having difficulties texturing... i used to know how todo this. what commands where used for texture mapping again? (repositiong the texturecordinates).

Blitz Docs > 3D - Category > Texture > TextureCoords

texture - name of texture
coords -
0: UV coordinates are from first UV set in vertices (default)
1: UV coordinates are from second UV set in vertices


;)

doh.. how come i missed that... thanks!