mojo3d:Not understanding Texcoord on cube of quads

[PakzParticipant]

I have a hard time understanding how to texture a mesh cube. I have been at it for hours now. I have been able to get a few sides of a cube to be textured correctly(I think) but other sides do not seem to get set correctly.

There is also texcoord1 and this seems to do not do anything. I have been at it with remapping the vertices but no succes yet.

I have created the code below from code collected from this forum. Texturing and creating a quad.

 

Monkey

#Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class MyWindow Extends Window Field _scene:Scene Field _camera:Camera Field _light:Light Field _model:Model Field _rectCanvas:Canvas Field _rectImage:Image Method New() 'get scene ' _scene=Scene.GetCurrent() 'create camera ' _camera=New Camera _camera.Near=.1 _camera.Far=100 _camera.Move( 0,0,-5 ) 'create light ' _light=New Light _light.RotateX( 90 ) 'aim directional light downwards - 90 degrees. local mesh:=createcube() 'create model for the mesh ' '_model.Material=New PbrMaterial( Color.Red ) '_model.Material.CullMode=CullMode.None _model = New Model() _model.Mesh=mesh _model.Materials = _model.Materials.Resize(mesh.NumMaterials) Local sm:= New PbrMaterial() _rectImage=New Image( 256, 256 ) _rectCanvas=New Canvas( _rectImage ) sm.ColorTexture = _rectImage.Texture sm.ColorTexture.Flags = TextureFlags.FilterMipmap 'sm.CullMode=CullMode.None _model.Materials[mesh.NumMaterials - 1] = sm End Method Method OnRender( canvas:Canvas ) Override RequestRender() RenderTexture() controls() '_model.RotateY( 1 ) '_model.RotateZ( -1 ) _scene.Update() _scene.Render( canvas,_camera ) canvas.DrawText( "cursors and wasd - Width="+Width+", Height="+Height+", FPS="+App.FPS,0,0 ) If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() End Method Method createcube:Mesh() 'create cube mesh ' Local vertices:=New Vertex3f[8] vertices[0].position=New Vec3f( -1, 1,-1 )'left front top vertices[1].position=New Vec3f( 1, 1,-1 )'right front top vertices[2].position=New Vec3f( 1,-1,-1 )'right front bottom vertices[3].position=New Vec3f( -1,-1,-1 )'left front bottom vertices[4].position=New Vec3f( -1, 1, 1 )'left back top vertices[5].position=New Vec3f( 1, 1, 1 )'right back top vertices[6].position=New Vec3f( 1,-1, 1 )'right back bottom vertices[7].position=New Vec3f( -1, -1, 1 )'left back bottom ' Texture coordinates represent coordinates within the image, where ' 0,0=top left, 1,0=top right, 1,1=bottom right, 0,1=bottom left vertices[0].texCoord0 = New Vec2f(0,0) vertices[1].texCoord0 = New Vec2f(1,0) vertices[2].texCoord0 = New Vec2f(1,1) vertices[3].texCoord0 = New Vec2f(0,1) vertices[4].texCoord0 = New Vec2f(1,0) vertices[5].texCoord0 = New Vec2f(0,0) vertices[6].texCoord0 = New Vec2f(0,1) vertices[7].texCoord0 = New Vec2f(1,1) Local indices:=New UInt[36] 'front indices[0]=0 indices[1]=1 indices[2]=2 indices[3]=0 indices[4]=2 indices[5]=3 ' left side indices[6]=4 indices[7]=0 indices[8]=3 indices[9]=4 indices[10]=3 indices[11]=7 'back side indices[12]=5 indices[13]=4 indices[14]=7 indices[15]=5 indices[16]=7 indices[17]=6 'right side indices[18]=1 indices[19]=5 indices[20]=6 indices[21]=1 indices[22]=6 indices[23]=2 'top side indices[24]=4 indices[25]=5 indices[26]=1 indices[27]=4 indices[28]=1 indices[29]=0 'bottom side indices[30]=3 indices[31]=2 indices[32]=6 indices[33]=3 indices[34]=6 indices[35]=7 Return New Mesh( vertices,indices ) End Method Method RenderTexture() If Not _rectCanvas Then _rectCanvas=New Canvas( _rectImage ) Endif 'This should be orange with white text on 'But since I'm drawing something in the top left corner - 'I'm just getting that top left pixel on the entire rectangle _rectCanvas.Clear( Color.Blue ) _rectCanvas.Color = Color.White _rectCanvas.DrawText( "Hello World", Rnd(8,12), 8 ) _rectCanvas.Color = Color.Orange _rectCanvas.DrawRect( 50, 50 , 200 ,90) 'White in the top left _rectCanvas.Flush() End Method Method controls() If Keyboard.KeyDown(Key.W) Then _camera.Move(0,0,.2) If Keyboard.KeyDown(Key.S) Then _camera.Move(0,0,-.2) If Keyboard.KeyDown(Key.A) Then _camera.Move(-.2,0,0) If Keyboard.KeyDown(Key.D) Then _camera.Move(.2,0,0) If Keyboard.KeyDown(Key.Up) Then _camera.Rotate(1,0,0) If Keyboard.KeyDown(Key.Down) Then _camera.Rotate(-1,0,0) If Keyboard.KeyDown(Key.Left) Then _camera.Rotate(0,1,0) If Keyboard.KeyDown(Key.Right) Then _camera.Rotate(0,-1,0) End Method End Class Function Main() New AppInstance New MyWindow App.Run() End

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#Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class MyWindow Extends Window Field _scene:Scene Field _camera:Camera Field _light:Light Field _model:Model   Field _rectCanvas:Canvas Field _rectImage:Image Method New() 'get scene ' _scene=Scene.GetCurrent() 'create camera ' _camera=New Camera _camera.Near=.1 _camera.Far=100 _camera.Move( 0,0,-5 ) 'create light ' _light=New Light _light.RotateX( 90 ) 'aim directional light downwards - 90 degrees. local mesh:=createcube() 'create model for the mesh ' '_model.Material=New PbrMaterial( Color.Red ) '_model.Material.CullMode=CullMode.None _model = New Model() _model.Mesh=mesh _model.Materials = _model.Materials.Resize(mesh.NumMaterials)   Local sm:= New PbrMaterial() _rectImage=New Image( 256, 256 ) _rectCanvas=New Canvas( _rectImage ) sm.ColorTexture = _rectImage.Texture sm.ColorTexture.Flags = TextureFlags.FilterMipmap 'sm.CullMode=CullMode.None _model.Materials[mesh.NumMaterials - 1] = sm End Method Method OnRender( canvas:Canvas ) Override RequestRender() RenderTexture() controls() '_model.RotateY( 1 ) '_model.RotateZ( -1 ) _scene.Update() _scene.Render( canvas,_camera ) canvas.DrawText( "cursors and wasd - Width="+Width+", Height="+Height+", FPS="+App.FPS,0,0 ) If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() End Method     Method createcube:Mesh() 'create cube mesh ' Local vertices:=New Vertex3f[8] vertices[0].position=New Vec3f( -1, 1,-1 )'left front top vertices[1].position=New Vec3f(  1, 1,-1 )'right front top vertices[2].position=New Vec3f(  1,-1,-1 )'right front bottom vertices[3].position=New Vec3f( -1,-1,-1 )'left front bottom vertices[4].position=New Vec3f( -1, 1, 1 )'left back top vertices[5].position=New Vec3f(  1, 1, 1 )'right back top vertices[6].position=New Vec3f(  1,-1, 1 )'right back bottom vertices[7].position=New Vec3f( -1, -1, 1 )'left back bottom     '  Texture coordinates represent coordinates within the image, where ' 0,0=top left, 1,0=top right, 1,1=bottom right, 0,1=bottom left vertices[0].texCoord0 = New Vec2f(0,0) vertices[1].texCoord0 = New Vec2f(1,0) vertices[2].texCoord0 = New Vec2f(1,1) vertices[3].texCoord0 = New Vec2f(0,1) vertices[4].texCoord0 = New Vec2f(1,0) vertices[5].texCoord0 = New Vec2f(0,0) vertices[6].texCoord0 = New Vec2f(0,1) vertices[7].texCoord0 = New Vec2f(1,1) Local indices:=New UInt[36] 'front indices[0]=0 indices[1]=1 indices[2]=2 indices[3]=0 indices[4]=2 indices[5]=3 ' left side indices[6]=4 indices[7]=0 indices[8]=3 indices[9]=4 indices[10]=3 indices[11]=7 'back side indices[12]=5 indices[13]=4 indices[14]=7 indices[15]=5 indices[16]=7 indices[17]=6 'right side indices[18]=1 indices[19]=5 indices[20]=6 indices[21]=1 indices[22]=6 indices[23]=2 'top side indices[24]=4 indices[25]=5 indices[26]=1 indices[27]=4 indices[28]=1 indices[29]=0 'bottom side indices[30]=3 indices[31]=2 indices[32]=6 indices[33]=3 indices[34]=6 indices[35]=7 Return New Mesh( vertices,indices ) End Method Method RenderTexture() If Not _rectCanvas Then _rectCanvas=New Canvas( _rectImage ) Endif 'This should be orange with white text on 'But since I'm drawing something in the top left corner - 'I'm just getting that top left pixel on the entire rectangle _rectCanvas.Clear( Color.Blue ) _rectCanvas.Color = Color.White _rectCanvas.DrawText( "Hello World", Rnd(8,12), 8 ) _rectCanvas.Color = Color.Orange _rectCanvas.DrawRect( 50, 50 , 200 ,90) 'White in the top left _rectCanvas.Flush() End Method   Method controls() If Keyboard.KeyDown(Key.W) Then _camera.Move(0,0,.2) If Keyboard.KeyDown(Key.S) Then _camera.Move(0,0,-.2) If Keyboard.KeyDown(Key.A) Then _camera.Move(-.2,0,0) If Keyboard.KeyDown(Key.D) Then _camera.Move(.2,0,0) If Keyboard.KeyDown(Key.Up) Then _camera.Rotate(1,0,0) If Keyboard.KeyDown(Key.Down) Then _camera.Rotate(-1,0,0) If Keyboard.KeyDown(Key.Left) Then _camera.Rotate(0,1,0) If Keyboard.KeyDown(Key.Right) Then _camera.Rotate(0,-1,0) End Method   End Class Function Main() New AppInstance New MyWindow App.Run() End

 

[Mark SiblyKeymaster]

If you want unique texcoords for each face of the cube (which I’m guessing is what you’re after) you need to duplicate the ‘shared’ vertices (ie: vertices with the same position) so each vertex gets its own texcoords. This will allow vertex 0 above to have different tex coords when used in the front quad (eg: 0,0) than when used in the left quad( eg: 1,0) because it’s really 2 vertices.

This goes for any vertex attribute you want to to be different depending on the polygon it’s used in. For example, to ahieve flat-shading, vertices will have a different normal for each triangle they are used in (ie” the triangle’s normal) so a flat shaded mesh can’t have *any* shared vertices.

Anyway, this means you should end up with 24 vertices (6 faces * 4 vertices per face) altogether. This is what Mesh.CreateBox does, you might want to have a look at that…

And note that texcoord1 is not used by the built in shader.

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