Sky Issues

Blitz3D Forums/Blitz3D Programming/Sky Issues

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Ross C
 #1
Firstly, i wouldn't use a blitz cube as a skybox. Mainly because your going to have problems texturing it.

Try this function. I can't remember where it came from, but i used it one of my projects. You call the function and it will create a skybox, based on the textures you pass.

Function create_skybox(f$,r$, b$,l$, t$, bt$, sx, sy, sz);front right back left top bottom scalex,y,z
    mesh = CreateMesh()

    ;front face
    brush = LoadBrush(f$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,-1,+1,-1,0,0
    AddVertex surface,+1,+1,-1,1,0
    AddVertex surface,+1,-1,-1,1,1
    AddVertex surface,-1,-1,-1,0,1
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush

    ;right face
    brush = LoadBrush(r$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,+1,+1,-1,0,0
    AddVertex surface,+1,+1,+1,1,0
    AddVertex surface,+1,-1,+1,1,1
    AddVertex surface,+1,-1,-1,0,1
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush

    ;back face
    brush = LoadBrush(b$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,+1,+1,+1,0,0
    AddVertex surface,-1,+1,+1,1,0
    AddVertex surface,-1,-1,+1,1,1
    AddVertex surface,+1,-1,+1,0,1
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush
 
    ;left face
    brush = LoadBrush(l$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,-1,+1,+1,0,0
    AddVertex surface,-1,+1,-1,1,0
    AddVertex surface,-1,-1,-1,1,1
    AddVertex surface,-1,-1,+1,0,1
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush

    ;top face
    brush = LoadBrush(t$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,-1,+1,+1,0,1
    AddVertex surface,+1,+1,+1,0,0
    AddVertex surface,+1,+1,-1,1,0
    AddVertex surface,-1,+1,-1,1,1
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush
   
    ;bottom face 
    brush = LoadBrush(bt$,49)
    surface = CreateSurface(mesh,brush)
    AddVertex surface,-1,-1,-1,1,0
    AddVertex surface,+1,-1,-1,1,1
    AddVertex surface,+1,-1,+1,0,1
    AddVertex surface,-1,-1,+1,0,0
    AddTriangle surface,0,1,2
    AddTriangle surface,0,2,3
    FreeBrush brush
    
    ScaleMesh mesh,sx,sy,sz
    FlipMesh mesh
    EntityFX mesh,1+4+8; make fullbright
    Return mesh
End Function


You would do this to use this function. Just as you would to load a texture, include the file name of the texture for the TOP, BOTTOM, LEFT, RIGHT, FRONT and BACK sides, followed by an X Y and Z scale. The function does the rest. In the below example, the skybox would now by assigned the the variable "skybox"

Global skybox = create_skyBox("level1\sky_front.png","level1\sky_right.png","level1\sky_back.png","level1\sky_left.png", "level1\sky_top.png", "level1\sky_bottom.png",350,150,350)