I think what you need is jit.xfade, you can create two jit.gl.gridshape whit matrixoutput 1 and then send them to jit.xfade and back to jit.gl.render and there you go.

heres an example

Hi Francisco :)

Thank you for your answer. In fact I did not try your approach, instead I tried two jit.gl.gridshape with matrix output 1 and send them to a jit.op... I tried different operators but i did not manage what I pretend. Let me be more clear:

I want to cut of a square inside or inscribed in a circle... something like https://www.gmatpill.com/images/PS/circle_inscribed_square.png being white the erase_color... so we can look through the square hole.

If you have any idea on how to do that I appreciate!

Cheers,

André

I think this needs to be done with textures/color. Send both shapes to a jit.gl.node @erase color 0.5 0.5 0.5 1. Then gridshape @shape plane @color 1. 1. 1. 1. @ layer 0 Gridshape @ shape circle @ color 0. 0. 0. 1. @ layer 1 Apply all movement and rotation instructions to both gridshapes.

Thank you Andro!

But it does not work ...

Missed the part with it being see through. I wouldn't try to make the basic shape in max. Download blender. Create a circle and a cube, use the boolean modifier to cut out the square shape from the circle. Export as dae model import with jit.gl.model.

Thanks Andro, but I want to be able to change the size of the square inside de circle ;) Circle fixed size and square variable size.

I will keep linkage for a solution :)

Well thats not so hard if you get a little creative. The square shape can be defined as a few vertex points. By using jit.gl.model @matrixoutput 1 to a jit.gl.mesh Then only altering the vertex points of the square form (x,y vertexes only) then you can change the square form. Start experimenting !

Hi Andro,

I managed something with blend_modes... We can see the background color through the square inside the circle but if a place a videoplane behind the circle and the square I can't see the videoplane any longer :-/