Code archives/File Utilities/Import OBJ

Good work. If you allow me, I will use it in my programm.

Use away.

This function is pretty buggy. It won't even compile.

its not buggy. it's just got a function called SaveTex in it which isn't there because it's "tattoo specific", this post explains it.
http://www.blitzbasic.com/Community/posts.php?topic=44535

so you comment that line out and then it's ok.
also here is a working example.

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
light=CreateLight()
RotateEntity light,90,0,0

filename$="yourname.obj"

obj=LoadObj(filename$)
PositionEntity obj,0,0,5

While Not KeyHit(1)
 RenderWorld
 
 TurnEntity obj,0.4,0.3,0.2

 Text 0,0,"filename$="+filename$

 Flip
Wend

; By Terabit

Function LoadObj(file$)
 Local infile, intex$, cmd$, themesh, blanksurf, ek, its
 Local P1$, P2$, P3$, P4$, vtx1#, vtx2#, vtx3#, vtx4#
 Local tx1#, tx2#, tx3#, tx4#, retmesh, v, uvo 
 If FileType(file$)=0 Then Return -1
 infile = ReadFile(file$)
 
 themesh = CreateMesh()
 tempvert = CreateMesh()
 retmesh = CreateMesh()
 
 TempVertSurf = CreateSurface(tempvert)
 blanksurf = CreateSurface(themesh)
 
 While Not Eof(infile)
 intex$ = ReadLine$(infile)
 cmd$ = ParseEntry(intex$,0)
 its = CountIt(intex$," ")
 
 If its>1 Then P1$ = ParseEntry(Intex$,1) Else p1$=""
 If its>2 Then P2$ = ParseEntry(Intex$,2) Else p2$=""
 If its>3 Then P3$ = ParseEntry(Intex$,3) Else p3$=""
 If its>4 Then P4$ = ParseEntry(Intex$,4) Else p4$=""
 
 ;DebugLog "Command: "+cmd$+" P1: "+p1$+" P2: "+p2$+" P3: "+p3$+" P4: "+p4$
 
 Select cmd$
 Case "V"
 AddVertex blanksurf,Float(P1$),Float(P2$),Float(P3$)*-1
 Case "VT"
 AddVertex TempVertSurf,Rand(10),Rand(10),Rand(10)
 VertexTexCoords TempVertSurf,vtx,Float(P1$),1-Float(P2$)
 ;DebugLog "P1$="+p1$+" P2$= "+p2$
 ;DebugLog "U = "+P1$+" V = "+P2$
 vtx = vtx + 1
 Case "USEMTL"
 DebugLog "Hoot "+P1$
 currentsurf = CreateSurface(retmesh) 
 If Trim$(P1$)<>"" Then
  If Instr(p1$,".")<>0 And FileType(modelpath$+p1$)<>0 Then sometex = LoadTexture(modelpath$+p1$,1+VRAM) : Goto passway
  If FileType(modelpath$+p1$+".PNG")<>0 Then sometex = LoadTexture(modelpath$+p1$+".PNG",1+VRAM) : Goto passway
  If FileType(modelpath$+p1$+".BMP")<>0 Then sometex = LoadTexture(modelpath$+p1$+".BMP",1+VRAM) : Goto passway
  If FileType(modelpath$+p1$+".TGA")<>0 Then sometex = LoadTexture(modelpath$+p1$+".TGA",1+VRAM) : Goto passway
  If FileType(modelpath$+p1$+".JPG")<>0 Then sometex = LoadTexture(modelpath$+p1$+".JPG",1+VRAM) : Goto passway

  sometex = CreateTexture(512,512,1+VRAM)
  SetBuffer TextureBuffer(sometex)
  ClsColor 128,128,128
  Cls
  SetBuffer BackBuffer()
  ;savetex(p1$+".PNG",sometex)
  FreeTexture sometex
  sometex = LoadTexture(modelpath$+p1$+".PNG",1+VRAM)

.passway
   If sometex<>0 Then
    somebrush = CreateBrush(255,255,255)
    BrushTexture somebrush,sometex
    PaintSurface currentsurf,somebrush
   EndIf
  EndIf
 Case "F"
 If currentsurf = 0 Then 
  currentsurf = CreateSurface(retmesh)
  sometex = CreateTexture(512,512,1+VRAM)
  SetBuffer TextureBuffer(sometex)
  ClsColor 128,128,128
  Cls
  SetBuffer BackBuffer()
  somebrush = CreateBrush(255,255,255)
  BrushTexture somebrush,sometex
  PaintSurface currentsurf,somebrush
 EndIf
 
  Vtx1# = -65535 : TX1# = -65535 
  Vtx2# = -65535 : TX2# = -65535 
  Vtx3# = -65535 : TX3# = -65535 
  Vtx4# = -65535 : TX4# = -65535 
   
  If its>1 Then
   ug = CountIT(P1$,"/")
   If ug>0 Then
   Vtx1#=Float(ParseEntry(p1$,0,"/"))-1
   EndIf
 
   If ug>1 Then
   tx1# = Float(ParseEntry(p1$,1,"/"))-1
   EndIf
  EndIf

  If its>2 Then
   ug = CountIT(P2$,"/")
   If ug>0 Then
   Vtx2#=Float(ParseEntry(p2$,0,"/"))-1
   EndIf
 
   If ug>1 Then
   tx2# = Float(ParseEntry(p2$,1,"/"))-1
   EndIf
  EndIf

  If its>3 Then
   ug = CountIT(P3$,"/")
   If ug>0 Then
   Vtx3#=Float(ParseEntry(p3$,0,"/"))-1
   EndIf
 
   If ug>1 Then
   tx3# = Float(ParseEntry(p3$,1,"/"))-1
   EndIf
  EndIf
  
  
  If its>4 Then
   ug = CountIT(P4$,"/")
   If ug>0 Then
   Vtx4#=Float(ParseEntry(p4$,0,"/"))-1
   EndIf
 
   If ug>1 Then
   tx4# = Float(ParseEntry(p4$,1,"/"))-1
   EndIf
  EndIf

  If vtx1<0 Then vtx1 = 0
  If vtx2<0 Then vtx2 = 0
  If vtx3<0 Then vtx3 = 0
  If vtx4<0 Then vtx4 = 0
  
  If vtx1>CountVertices(blanksurf)-1 Then vtx1 = CountVertices(blanksurf)-1
  If vtx2>CountVertices(blanksurf)-1 Then vtx2 = CountVertices(blanksurf)-1
  If vtx3>CountVertices(blanksurf)-1 Then vtx3 = CountVertices(blanksurf)-1
  If vtx4>CountVertices(blanksurf)-1 Then vtx4 = CountVertices(blanksurf)-1
  
  If tx1>CountVertices(tempvertsurf)-1 Then tx1 = CountVertices(tempvertsurf)-1
  If tx2>CountVertices(tempvertsurf)-1 Then tx2 = CountVertices(tempvertsurf)-1
  If tx3>CountVertices(tempvertsurf)-1 Then tx3 = CountVertices(tempvertsurf)-1
  If tx4>CountVertices(tempvertsurf)-1 Then tx4 = CountVertices(tempvertsurf)-1
  
  v = CountVertices(currentsurf)
  
  If its>1 Then
   If tx1<0 Then tx1 = tx1 + vtx+1 
   UVO = TX1
   If CountVertices(TempVertSurf)=0 Then
    AddVertex currentsurf,VertexX(blanksurf,vtx1),VertexY(blanksurf,vtx1),VertexZ(blanksurf,vtx1)
   Else
    AddVertex currentsurf,VertexX(blanksurf,vtx1),VertexY(blanksurf,vtx1),VertexZ(blanksurf,vtx1),VertexU(TempVertSurf,UVO),VertexV(TempVertSurf,UVO)
   EndIf
  EndIf
  If its>2 Then
   If tx2<0 Then tx2 = tx2 + vtx+1     
   UVO = TX2
   ;DebugLog "TX2= "+tx2
   If CountVertices(TempVertSurf)=0 Then
    AddVertex currentsurf,VertexX(blanksurf,vtx2),VertexY(blanksurf,vtx2),VertexZ(blanksurf,vtx2)
   Else
    AddVertex currentsurf,VertexX(blanksurf,vtx2),VertexY(blanksurf,vtx2),VertexZ(blanksurf,vtx2),VertexU(TempVertSurf,UVO),VertexV(TempVertSurf,UVO)
   EndIf
  EndIf
  If its>3 Then
   If tx3<0 Then tx3 = tx3 + vtx+1
   UVO = TX3
   ;DebugLog "TX3= "+tx3
   If CountVertices(TempVertSurf)=0 Then
   AddVertex currentsurf,VertexX(blanksurf,vtx3),VertexY(blanksurf,vtx3),VertexZ(blanksurf,vtx3)
   Else
   AddVertex currentsurf,VertexX(blanksurf,vtx3),VertexY(blanksurf,vtx3),VertexZ(blanksurf,vtx3),VertexU(TempVertSurf,UVO),VertexV(TempVertSurf,UVO)
   EndIf
  EndIf
  If its>4 Then
   If tx4<0 Then tx4 = tx4 + vtx+1    
   UVO = TX4
   If CountVertices(TempVertSurf)=0 Then
   AddVertex currentsurf,VertexX(blanksurf,vtx4),VertexY(blanksurf,vtx4),VertexZ(blanksurf,vtx4)
   Else
   AddVertex currentsurf,VertexX(blanksurf,vtx4),VertexY(blanksurf,vtx4),VertexZ(blanksurf,vtx4),VertexU(TempVertSurf,UVO),VertexV(TempVertSurf,UVO)
   EndIf
  EndIf
  
  AddTriangle currentsurf,v,v+1,v+2
  
  If its>4 Then
   AddTriangle currentsurf,v+2,v+3,v
  EndIf
    
 End Select
 
 Wend
 CloseFile infile
 FitMesh retmesh,0,0,0,1,1,1,True
 FlipMesh retmesh
 centermesh (retmesh)
 UpdateNormals retmesh
 FreeEntity tempvert
 FreeEntity themesh
 
 Return retmesh
End Function

Function ParseEntry$( Message$, Item, Sep$ = " ")
 Local fas, count, spos, epos, num#, epon#,pos
 
 Repeat
  fas = Instr(message$,sep$,fas+1)
  count = count + 1 
 Until fas = 0 Or count = item
 
 spos = fas+1
 epos = Instr(message$+sep$,sep$,fas+1)
 grub$ = Upper$(Trim$(Mid$(message$,spos,(epos-spos))))
 If Instr(grub$,"E-") Then 
  pos = Instr(grub$,"E-")
  ;1.41e-02 = 1.41 * (10 ^ -2)
  num# = Left$(grub$,pos-1)
  epon# = Mid$(grub$,pos+1,Len(grub$)-(pos))
  ;'DebugLog "Total: "+grub$
  ;'DebugLog "Num: "+num#
  ;'DebugLog "etex: "+Mid$(grub$,pos+1,Len(grub$)-(pos))
  ;'DebugLog "Exp: "+epon#
  num# = num# * (10 ^ epon#)
  Return num#
  Return "0.0"
 Else 
  Return grub$
 EndIf
End Function

Function CountIt( Message$, Sep$=" ")
 message$=Trim$(message$)
 Local fas, count
 Repeat
 fas = Instr(message$,sep$,fas+1)
  If fas<>0 Then count = count + 1 
 Until fas = 0
 
 Return count+1
End Function

Function CenterMesh (entity)
    FitMesh entity, -(MeshWidth (entity) / 2), -(MeshHeight (entity) / 2), -(MeshDepth (entity) / 2), MeshWidth (entity), MeshHeight (entity), MeshDepth (entity)
End Function