[vtkusers] how to Using OpenGL with VTK???????

[Utkarsh Ayachit]

One possibility is to write your own subclass of vtkProp (or any of its 
subclasses) and then put the OpenGL code in overloaded 
"RenderOpaqueGeometry" or any of the other render methods.

Utkarsh

ҶԪֵ wrote:
> Hi,
>  	I would like to know if it is possible to use OpenGL commands in
>  conjonction with VTK. Where should I place OpenGL commands in a VTK
>  application ? For example, I would like to use fog and antialiasing.
> For example, if I wanted to draw a OpenGL circle on top of my VTK terrain
>  I would use this OpenGL code somewhere:
> 
>  				glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	// 
>  				glLoadIdentity();							// Reset The matrix
>  				glColor3ub(255, 0, 0);
>      				glPushMatrix();
>     				glTranslatef(x, y, 0);
>    				glBegin(GL_LINE_LOOP);
>         				for( float ang=0; ang <= 2*3.141; ang += 0.1)
>  	   			{
>         				glVertex2d( radius * cos(ang), radius * sin(ang));
> 	   			}
>     				glEnd();
>     				glPopMatrix();
> 
> What calls do I have to make to the vtkRenderWindow, vtkRenderer objects
> to allow this to work, where would I place the OpenGL code?
> 
>  
>  Thanks
> 
> 
> 	
> 
> 
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