Help SkyBox

Blitz3D Forums/Blitz3D Programming/Help SkyBox

Yue	(Posted 2012) [#1]

I am creating a skybox, now do not know how to bind the corners where the surfaces are not known.

[bbcode]
Function SkyBox(Frente$="",Derecha$="")

Local Cubo% = CreateMesh()
Local Brocha% = LoadBrush(Frente$)
Local Superficie% = CreateSurface(Cubo%,Brocha%)

AddVertex (Superficie%,-1,1,1,0,0)
AddVertex (Superficie%,1,1,1,1,0)
AddVertex (Superficie%,1,-1,1,1,1)
AddVertex (Superficie%,-1,-1,1,0,1)

AddTriangle (Superficie%,0,1,2)
AddTriangle (Superficie%,3,0,2)
FreeBrush (Brocha%)

Brocha% = LoadBrush(Derecha$)
Superficie% = CreateSurface(Cubo%,Brocha%)

AddVertex (Superficie%,1,1,1,0,0)
AddVertex (Superficie%,1,1,-1,1,0)
AddVertex (Superficie%,1,-1,-1,1,1)
AddVertex (Superficie%,1,-1,1,0,1)

AddTriangle(Superficie%,0,1,2)
AddTriangle(Superficie%,3,0,2)

FreeBrush (Brocha%)

EntityFX Cubo%,1

Return Cubo%

End Function

[/bbcode]

RemiD

(Posted 2012) [#2]

You can try 2 things :

->When the program loads the texture, use the flags +16+32
or
->Set the UV coordinates of your vertices with a slight offset towards the center of the texture :

Example for the quad at +Z of a skybox with a width, height, depth of 1 (you can scale it later) :
UOffset# = 0.001
VOffset# = 0.001
AddVertex (Surface, -0.5, 0.5, 0.5, 0.000+UOffset#, 0.000+VOffset#)
AddVertex (Surface, 0.5, 0.5, 0.5, 1.000-UOffset#, 0.000+VOffset#)
AddVertex (Surface, -0.5, -0.5, 0.5, 0.000+UOffset#, 1.000-VOffset#)
AddVertex (Surface, 0.5, -0.5, 0.5, 1.000-UOffset#, 1.000-VOffset#)
AddTriangle (Surface,0,1,2)
AddTriangle (Surface,2,1,3)

Then you change the UOffset# and VOffset# values until you don't see the black border.
Please note that you also have to do these tweaks for the others quads of the skybox.

Last edited 2012

Yue	(Posted 2012) [#3]

@RemiD
Thanks You.

I've settled on the flag at the time of loading the brush. Now I have a question from where the flag 49, I see that also works, and the flag is not on the load information of textures or brushes.

Kryzon

(Posted 2012) [#4]

You're adding +1 to 48.

1 is the "Color" flag, which doesn't make any visual difference but as I recall it increases compatibility with exotic hardware. I think Yasha may know more about this.

Prefer to use 49.

Yasha

(Posted 2012) [#5]

All I know about this is that failing to use flag 1 can cause crashes or disappeared textures on some devices. No idea why.