Federico-AmazingMaxStuff

do you happen to know if it's possible to use a texture inside a jit.gl.tf shader without passing it as a jit.gl.buffer object but as a sampler or at least without having to feed it back?

Hi all,
do you happen to know if it's possible to use a texture inside a jit.gl.tf shader without passing it as a jit.gl.buffer object but a

using-a-texture-inside-a-jit-gl-tf-shader-instead-of-a-jit-gl-buffer

There are some things i'm strugling with not being able to pass a texture to jit.gl.tf shader.

i've got the same question. 
There are some things i'm strugling with not being able to pass a texture to jit.gl.tf shader.

Same question here! This capability would shift the already awesome jit.gl.tf into next gear...

I've discovered this is actually possible, it just must be referenced from inside the shader using the texture name, so <texture name="texName" />

The problem for me remains where to get the texture coordinates to read that texture from.

I've discovered this is actually possible, it just must be referenced from inside the shader using the texture name, so <texture name="texName"  />

The problem for me remains where to get the texture coordinates to read that texture from. 

can you reference more that one texture from inside the shader?

if so, maybe you could pass it another one containing the coordinates

can you reference more that one texture from inside the shader?
if so, maybe you could pass it another one containing the coordinates

Hi Matteo, yes you can, I've tried that actually, with mixed results. 

If you give it a try I would be happy to know how it goes

Hi Matteo, yes you can, I've tried that actually, with mixed results. 
If you give it a try I would be happy to know how it goes

But the coordinates you need to pass in a buffer, otherwise how are you gonna read the coordinates if you pass them from a texture? You would first need the coordinates to read that texture. 

But the coordinates you need to pass in a buffer, otherwise how are you gonna read the coordinates if you pass them from a texture? You would first need the coordinates to read that texture. 
Mind blowned 

Hi guys, did you solve this problem? Are there any examples to study? thanks

Yes, it is indeed possible, I use that for example in the glsl particles videos: 

Hi Rajan! 
Yes, it is indeed possible, I use that for example in the glsl particles videos: 
https://youtu.be/Kc4F4WDeMgE 

EXTRUDER.jxs

test_extruder.maxpat

Thanks Federico, I studied the videos, the patches but I still stucked.

I'm trying to extrude the z coordinates of a plane using a noise texture inside a transform feedback shader, I isolated the problem in this patch, if you have time please have a look, probably there is an error I can't see.

Thanks Federico, I studied the videos, the patches but I still stucked.
I'm trying to extrude the z coordinates of a plane using a noise texture inside a transform feedback shader, I isolated the problem in this patch, if you have time please have a look, probably there is an error I can't see.

I solved the problem at 90%, it was about @rectangular 1 in the imported texture , here is the fixed patch and shader.

But I'm still searching how to get the texture dimensions from inside the transform feedback shader, texdim0 doesn't work.

I solved the problem at 90%, it was about @rectangular 1 in the imported texture , here is the fixed patch and shader.
But I'm still searching how to get the texture dimensions from inside the transform feedback shader, texdim0 doesn't work.


https://cycling74.com/forums/accessing-texdim0-in-gl3

Solved with this post by Rob Ramirez
https://cycling74.com/forums/accessing-texdim0-in-gl3

I noticed that after the transform feedback magic my jit.gl.mesh isn't able to draw_mode tri_grid any more, I'm studing this behavior now.

thanks a lot, for that discussion here ! 

Hey, first thanks indeed for the discussion here! I managed to pass a texture in my jit.gl.tf shader, but as Micron said, it basically breaks jit.gl.mesh drawing modes (cannot use tri_grid anymore), and auto_normals doesn't work as well. Have you found a workaround, beside using a custom rendering shader for the jit.gl.mesh?

I guess that the "issue" is jit.gl.tf sending vertices positions in its own manner (maybe as a 1 dimension matrix?) rather than respecting the initial jit.gl.buffer @type position, but it's only an assumption.

Only an assumption here as well but i think you also specifically need to set the geometry shader to accommodate for the tri-grid if you want to use that. Unfortunately i'm also still learning Gl as well so i can't help further but i hope i got you at least one step further...

Using a Texture inside a jit.gl.tf Shader instead of a jit.gl.buffer