Wavefront obj file format save function

Blitz3D Forums/Blitz3D Programming/Wavefront obj file format save function

patmaba

(Posted 2006) [#1]

Hi,

I'm trying to write a blitz3d function to save a mesh to a .obj wavefront format.
I think i have a problem with the tag f into the obj file.

Someone can help me please ?

Graphics3D 800,600,0,2
SetBuffer BackBuffer()
SeedRnd MilliSecs()

Global c=CreateCube()
SaveToObj( c )
End 


Function SaveToObj( pMesh )
	fileout = WriteFile("mymesh.txt") 

	For i=1 To CountSurfaces( pMesh )
		Surface_Handle = GetSurface( pMesh, i )
		For j=0 To CountVertices( Surface_Handle ) - 1
			vx# = VertexX#(Surface_Handle, j)			
			vy# = VertexY#(Surface_Handle, j)			
			vz# = VertexZ#(Surface_Handle, j)				
		    WriteLine( fileout, "v " +vx+ " " + vy + " " + vz ) 		
		Next 
	Next 

	For i=1 To CountSurfaces( pMesh )
		Surface_Handle = GetSurface( pMesh, i )
		For j=0 To CountVertices( Surface_Handle ) - 1
			vnx# = VertexNX#(Surface_Handle, j)			
			vny# = VertexNY#(Surface_Handle, j)			
			vnz# = VertexNZ#(Surface_Handle, j)				
		    WriteLine( fileout, "vn " +vnx+ " " + vny + " " + vnz ) 		
		Next 
	Next 

	For i=1 To CountSurfaces( pMesh )
		Surface_Handle = GetSurface( pMesh, i )
		For j=0 To CountTriangles( Surface_Handle ) - 1			 
			a = TriangleVertex(Surface_Handle, j,0)			
			b = TriangleVertex(Surface_Handle, j,1)			
			c = TriangleVertex(Surface_Handle, j,2)					
		    WriteLine( fileout, "f " +a+ " " + b + " " + c ) 					
	Next
	Next
   CloseFile( fileout )

End Function

Floyd

(Posted 2006) [#2]

Blitz3D numbers the vertices starting from 0.

I think .obj expects them to start at 1.