FBORenderer

[Daniel]

Hi!
I'm trying to make the FBOrenderer only save a texture of the scene while a clipplane is enabled, and as soon as it's done, disable the clipplane and render the scene normally.

This is what I have in the sceneViewers beforeRender:

fboR.Active:=true;

  GL.Enable(GL_CLIP_PLANE0);
  SetPlane(clipPlane, PlaneMake(AffineVectorMake(myClip.AbsolutePosition),
  VectorNegate(AffineVectorMake(myClip.AbsoluteDirection))));
  GL.ClipPlane(GL_CLIP_PLANE0, @clipPlane);

  GLScene1.Objects.DoRender(rci,true,true);

  fboR.Active:=false;

  GL.Disable(GL_CLIP_PLANE0);

The texture in the materiallibrary becomes weird...
If I don't disable the clipplane, then the texture is ok.

Any idea how I can save only the clipped scene to a texture?

Cheers

[Jerome.D (BeanzMaster)]

Hi Daniel, can you make a simple test case ?

Have you try with the FBO's onBefore/OnAfter event ? Take a look in examples/effects/shadowfbo demo

Cheers

[Daniel]

Hi Jerome!

Thanks, I will give it a try!

Any chance to get this demo updated and converted to Lazarus?
https://sourceforge.net/p/glscene/code/HEAD/tree/branches/Examples/Shaders/GLSL/GLSL_Water/
I cannot manage to get it to compile in Lazarus.

It seems to have all the stuff I'm after, reflective water.

Cheers!

[Jerome.D (BeanzMaster)]

Hi, this demo need some work in code tor be compatible with Lazarus. The best way is to make a child of TGLSLCustomShader like the simple water shader i've done.
You need translate all opengl Command ike glCommandNameb become *GL.CommandName*
After accessing matrix not working like in the original delphi code

Have you try Ocean demo in samples/shader/glsl/ocean ?

[Daniel]

Thanks Jerome!
I will try som more to convert it.

Yes, I have used that demo and it helped me with other parts.
In this case I'm interested in reflection on objects on a surface, and using a clipplane to only reflect parts above the surface.
I'm trying to use the FBORenderer for the sampler2D in the shader.
But I cannot make it create the texture while the clipplane is enabled, and then disable the clipplane again.

I will upload a test case when I have one.
Currently I have a hard time making the FBORenderer work at all...

Cheers!

[Daniel]

A few lines who generate errors:
gl.LoadMatrixf(@FScene.CurrentBuffer.ModelMatrix); // incompatible types, Matrix4f expected single
FScene.CurrentBuffer.PopModelViewMatrix; // no identified member
gl.LoadMatrixf(FScene.CurrentBuffer.ModelMatrix); // incompatible types, Matrix4f expected single

Any idea what's wrong here?