titanpariah

I've started working a bit in jitter, and I'd like to be able to do some slab processing on an opengl scene. Basically, I'd like to redirect the rendered output which would normally be displayed in a window, have it render to a texture, which is then processed using slabs and mapped to a videoplane, which is output to the window.

Unfortunately, I can't seem to do this in a way that renders all objects in a timely fashion. I've tried using a matrix as a render destination, and even using asyncread, which both worked but were too slow, unless I accepted considerable quality loss.

I've tried using the method of capturing to a texture, but it seems like only one object can be captured to a texture at a time, and it doesn't seem like I can just capture the output of a render to a texture and have it work.

My final attempt, and the one that seems closest to working, is sharing the context of two renders, and rendering the output of one render to a texture, which is then processed and output by the second render. This initially seems to work, however, if I try to fullscreen or do anything else to the second render's window, the image disappears.

I realize I've babbled on about quite a few things here, but if someone could help me or tell me what I'm doing wrong, I'd greatly appreciate it. Here's a patch for the method that seems closest to working for me, unless I fullscreen the window:

I've started working a bit in jitter, and I'd like to be able to do some slab processing on an opengl scene.  Basically, I'd like to redirect the rendered output which would normally be displayed in a window, have it render to a texture, which is then processed using slabs and mapped to a videoplane, which is output to the window.

Unfortunately, I can't seem to do this in a way that renders all objects in a timely fashion.  I've tried using a matrix as a render destination, and even using asyncread, which both worked but were too slow, unless I accepted considerable quality loss.

My final attempt, and the one that seems closest to working, is sharing the context of two renders, and rendering the output of one render to a texture, which is then processed and output by the second render.  This initially seems to work, however, if I try to fullscreen or do anything else to the second render's window, the image disappears.

I realize I've babbled on about quite a few things here, but if someone could help me or tell me what I'm doing wrong, I'd greatly appreciate it.  Here's a patch for the method that seems closest to working for me, unless I fullscreen the window:

post-processing-opengl-scene

first, please post patches using the copy-compressed method. see the sticky topic in the main forum for an explanation.

rendering to texture does not require software rendering (ie matrix rendering) or shared contexts. it just requires careful ordering of drawcalls.

below is a patch demonstrating two techniques for rendering to texture. the one on the left uses gl.sketch's drawobject message and @capture attribute to capture several objects to a texture. i find this technique easier to handle for the most part.

the second uses gl.render's to_texture message to capture the entire drawbuffer preceding that message to a texture. as mentioned, pay close attention to the order of the messages to gl.render (as well as @automatic attributes on the scene objects, and the final videoplane).

please search the forum, as there's tons more info and examples.

hi.
first, please post patches using the copy-compressed method. see the sticky topic in the main forum for an explanation.

rendering to texture does not require software rendering (ie matrix rendering) or shared contexts.  it just requires careful ordering of drawcalls.

below is a patch demonstrating two techniques for rendering to texture.  the one on the left uses gl.sketch's drawobject message  and @capture attribute to capture several objects to a texture. i find this technique easier to handle for the most part.

Ahh, I'm sorry about that. Anyways, thank you so much; I've tried searching around for a solution, but maybe I just didn't know what to search for. Anyways, these both seem to work perfectly.

Ahh, I'm sorry about that.  Anyways, thank you so much; I've tried searching around for a solution, but maybe I just didn't know what to search for.  Anyways, these both seem to work perfectly.


Hmm, still have a bit of technical difficulty here. I'm using the sketch capture method, but if I replace one of the gridshapes with a model, the model disappears when I full-screen the window, and the max window displays a number of messages saying "ob3d_draw_end popmatrix: GL Error: Invalid value". These issues stop if I delete any and all slab objects associated with the renderer.

The issue sounds a bit similar to this one: 

https://cycling74.com/forums/index.php?t=msg&goto=170650&rid=9724&S=9c247e86c75684074909a4fd409f68cf&srch=model+render+slab#msg_170650

 but I have the latest version of Max, and I'm using a pc, not a mac. This might just be another instance where there's a simple solution that I can't figure out, but any help is appreciated.

Hmm, still have a bit of technical difficulty here.  I'm using the sketch capture method, but if I replace one of the gridshapes with a model, the model disappears when I full-screen the window, and the max window displays a number of messages saying "ob3d_draw_end popmatrix: GL Error: Invalid value".  These issues stop if I delete any and all slab objects associated with the renderer.

The issue sounds a bit similar to this one: https://cycling74.com/forums/index.php?t=msg&goto=170650&rid=9724&S=9c247e86c75684074909a4fd409f68cf&srch=model+render+slab#msg_170650 but I have the latest version of Max, and I'm using a pc, not a mac.  This might just be another instance where there's a simple solution that I can't figure out, but any help is appreciated.

Post-processing opengl scene