pointSize of shaderMaterial

[igitz]

hi, anyone knows why changing the value of "pointSize" doesn't influence the size of points of a shaderMaterial?

shaderMaterial.pointsCloud = true;
shaderMaterial.pointSize = 10;

[Pryme8]

Try: shaderMaterial.setFloat('pointSize', #);

[igitz]

and? how do you use the float pointSize in the fragment shader?

[Pryme8]

.... how ever you would want to ....

This is assuming you already have your shader set up, and a uniform float of pointSize.

[igitz]

thanks for the quick replies!

well, i'm trying to get something similar to http://www.babylonjs-playground.com/#OCR2S where .pointSize is a property of the material itself,

but i'm using a shaderMaterial, so i'm not really sure how to set up the same effect in the fragment shader.

[Pryme8]

http://www.babylonjs-playground.com/#OCR2S

Whoops ignore this I just comprehended what you asked.

If you could make a PG with the shaderMaterial in question, I can help.

[igitz]

ok thanks, it's more of a generic question, valid for any shaderMaterial that is applied to a Babylon Mesh.

i can try to set up a PG by tomorrow.

[Pryme8]

It’s not generic if it’s a shader material and you did not inclued the point cloud stuff.

a shader material you define yourself or compile from other shaders.  So if there is no point cloud support on the shaderMaterial then it won’t do anything.  The only reason it works with standard material is that shader has it set up and a setter for the variable pointSize that sets the value on the effect when it’s changed I’m assuming.

@NasimiAsl what’s the quickest way to add point cloud support to his shader? 

I would just copy and paste the fragment code for the pointcloud stuff outta the standardMaterials shader. 

[igitz]

great, i get what you mean now.

i assumed that since it is possible to use things like .wireframe = true; and .pointsCloud = true; with shaderMaterial, then pointSize would also be supported, but i get your point now.

some help with copy pasting the pointsCloud code from the standardMaterial would be much appreciated.

[Pryme8]

If wireframe and pointCloud work then point size should work, odd. When I get home I’ll take a look.

 

https://github.com/BabylonJS/Babylon.js/blob/master/src/Materials/babylon.shaderMaterial.ts

I do not see anything here for wireframe or pointCloud support.  

Ill get you a better awnser once I’m off my phone and on a pc.

[igitz]

shaderMaterial extends Material so i guess they should all be working (?)

[NasimiAsl]

hi

you wanna have fixed point size (because  pointed size depended to camera distance between vertex )?

[igitz]

well, yes i was thinking fixed point size,

but if i see the standardMaterial pointSize code then i can also try to relate it to the camera distance.

[NasimiAsl]

if you can find distance formula you can manage that by discard  need more  time to calculate that

y = f( length(vPositionW-vEyePosition) ) ; f is  your formula

http://www.babylonjs-playground.com/#OCR2S#19

it is not depend your shader that control by webgl base kernel so you can just discard that

find that  i am stupid most of the time

http://www.babylonjs-playground.com/#OCR2S#20

http://www.babylonjs-playground.com/#OCR2S#21

http://www.babylonjs-playground.com/#OCR2S#24

[NasimiAsl]

dear @Pryme8  i think you need add some uniform and use gl functions

so you need make shader progress with this attribute

vertexAttribPointer

so actully i don't know a fast way to change shaderMaterial to Pointed ShaderMaterial