mark2e

I've read somewhere that with max6 jit.gl.gridshape is using a mesh internally.

- Is that the case only with gridshape or with jit.gl.model / nurbs / sketch... aswel?

- Is there a way to access the tangents (or other vertex attributes) in a shader? A similar way one would do it with the original jit.gl.mesh object?

- And: As jit.gl.material generates its own shader is there a way to use the object with ones self-made shader? Would there be any benefit? Easy texture-storing for example?

I've read somewhere that with max6 jit.gl.gridshape is using a mesh internally. 

So My questions are:
- Is that the case only with gridshape or with jit.gl.model / nurbs / sketch... aswel?
- Is there a way to access the tangents (or other vertex attributes) in a shader? A similar way one would do it with the original jit.gl.mesh object? 

gridshape-now-using-internal-mesh-and-jit-gl-material-questions

"- Is that the case only with gridshape or with jit.gl.model / nurbs / sketch... aswel?"

only gl.gridshape uses a gl.mesh internally. however, there currently is no way to calculate tangents for gridshapes without output-ing to a gl.mesh. this patch demonstrates:

if a model file contains tangents, they will be loaded and made available to the vertex shader with jit.gl.model.

"- Is there a way to access the tangents (or other vertex attributes) in a shader? A similar way one would do it with the original jit.gl.mesh object? "

you can access tangents from either jit.gl.mesh or jit.gl.model by binding a vertex attribute, in the following manner:

"- And: As jit.gl.material generates its own shader is there a way to use the object with ones self-made shader? Would there be any benefit? Easy texture-storing for example? "

there is no way to provide a user-made shader to the jit.gl.material object.

Hey Rob, to access the tangent inside the shader do we only need to state the attribute vec3 tangent and bind in a generical way, or do we need to have a specific state binding? 

which doesn't work, I get the error "attribute name not valid"

Hey Rob, to access the tangent inside the shader do we only need to state the attribute vec3 tangent and bind in a generical way, or do we need to have a specific state binding? 
For example i have: 
<param name="tangent" type="vec3" state="VERTEX_ATTR" />

Also that doesn't work:
<param name="tangent" type="vec3" state="TANGENT" />

Thanks for any answer! 

hi federico, you should be able to receive tangents from a jit.gl.mesh object in your shader with: 

hi federico, you should be able to receive tangents from a jit.gl.mesh object in your shader with: 
<param name="tangent" type="vec3" state="TANGENT" />
<bind param="tangent" program="vs" />
and:
attribute vec3 tangent;

please let me know if that doesn't work.


it indeed seems to work, but if I don't assign the tangent attribute to a varying variable that goes into the fragment shader, the console keeps printing "invalid name attribute". 

One question on the side: do you know why the "transpose" function doesn't work, even if should be into glsl 1.2?

Thanks a lot, here is the patch and the shader to reproduce the error mentioned above 

test_tangent_attr.zip

Thanks for the answer Rob, 
it indeed seems to work, but if I don't assign the tangent attribute to a varying variable that goes into the fragment shader, the console keeps printing "invalid name attribute". 
The shader compiles though. 

One question on the side: do you know why the "transpose" function doesn't work, even if should be into glsl 1.2? 

Thanks a lot, here is the patch and the shader to reproduce the error mentioned above 


yeah this is an annoying issue with jitter jxs, the version tag was never fully implemented for the glsl engine, you still have to supply the #version define at the top of the shader.

simply add #version 120 at the top and you should be good to go with the transpose function.

Gridshape now using internal mesh and jit.gl.material questions