Problem in UV display

Posted Monday, 6 August, 2012 - 19:23 by Kfalcon in

Programming Support

Hello, I'm new to openTK but I have some experience in openGL (excluding textures)
Recently, I've been making a graphic engine for loading Re-Volt files. Theoretically the files are loaded successfully but render is messed up.

I suspect it's an init problem.

Here is my InitGL()

 TexUtil.InitTexturing()
        Dim Width% = Form1.GlControl1.Width
        Dim Height% = Form1.GlControl1.Height
        GL.Viewport(New System.Drawing.Size(Width, Height))
        GL.MatrixMode(MatrixMode.Projection)
        GL.LoadIdentity()
        GL.Frustum(-Width / 2, Width / 2, -Height / 2, Height / 2, -1, 1)

And here is how textures are loaded

  Public Sub InitAllTextures(ByVal model As PRM)
        Textures(0) = -1 'Empty
 
        For i = 0 To 10
            If IO.File.Exists(model.Directory & model.DirectoryName & Chr(i + 65) & ".bmp") Then
                Textures(i + 1) = TexLib.TexUtil.CreateTextureFromFile(model.Directory & model.DirectoryName & Chr(i + 65) & ".bmp")
            Else
                Textures(i + 1) = -1
            End If
        Next
 
    End Sub

OnRender()

        GL.Clear(ClearBufferMask.ColorBufferBit Or ClearBufferMask.DepthBufferBit)
        GL.MatrixMode(MatrixMode.Modelview)
        GL.LoadIdentity()
 
 
 
        If Done Then myw.Render()
        GL.Flush()
 
        GlControl1.SwapBuffers()

as for myw.Render() it work like this: (Poly = triangle)

{
GL.Begin(BeginMode.Triangles)
For Each Poly {
GL.BindTexture(TextureTarget.Texture2D, Poly.Tpage)
for each vertex In Poly { //vertex count = 3
GL.Color4(vertex.Color)
GL.TexCoord2(vertex.U,vertex.V)
GL.Normal3(vertex.normals)
GL.Vertex3(vertex.position)
}
}
GL.End()

}

I'm so desperate to find an answer! It has been already two weeks and nothing was finished. I'm really grateful to any answer.

Thanks for reading

Comments

A common problem is that textures are upside-down when loading models, but I think you need to fix the GL error first that you are doing by calling GL.BindTexture inside begin/end block. Move it before begin?

Hello thanks for your answer, I forgot to mention that I have multiplied the uv map with bitmap's size, the real result look like a 1px uvmapped model.

I've tried to place BindTexture before Begin but results are same.
I am going to try to use the vertex buffer, it may work :-/ ....

Thanks again for your answer

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Problem in UV display

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