My vertex shader line w = position.x*position.x always gives me a constant value

[sebavan]

@SergioFdo

This way I will have different positions for my vertexes (10 to the right), but the color will be given by their original position (the vec3 vPosition) … Right?

Yes this would work !!! vertex to move around and Fragment to shade or paint

@SergioFdo

v.x = v.x*v.x;
v.y = 0.0
v.z = v.z;

Nothing is being drawn!

This is expected as -5 * -5 would be 25 and you need to keep the sign to create a triangle.

@SergioFdo

What is happening? Why is v.x*.v.x always 25? How can I get the points
v.x = v.x*v.x
v.y = 0.0
v.z = v.z

be correctly painted?

Basically your vertices data needs to represent a triangle to be drawn but by squaring x, you end up with a point or rather a line which is not visible, so you simply need to keep the sign in https://playground.babylonjs.com/#7DRA7M#1