vicrucann / shader-3dcurve Goto Github PK

We compile this project without qt in linux and there is no compiler or linker error.When we try to run we got this error.

OpenGL error 'invalid enumerant' at after RenderBin::draw(..)
OpenGL error 'invalid enumerant' at after RenderBin::draw(..)
OpenGL error 'invalid enumerant' at after RenderBin::draw(..)
...
OpenGL error 'invalid enumerant' at after RenderBin::draw(..)

Windows pops up but there is no shape in the scene.

The first three normalize() in drawSegment() of polyline.geom may have trouble with arbitrary input.

I had to define

vec2 safe_normalize(vec2 v)
{
    float len = length(v);
    if (len == 0)
        return vec2(0, 1); // arbitrary
    else
        return v / len;
}

In my observation, ATI drivers do the right thing, NVIDIA and Intel drivers return something unreasonable.

The second pair of normalize() are maybe safe (?).

Hi, your idea is great! Howerve, I found that gl_Positions are used for interpolation before normalized by gl_Position.w, which is a non-linear behavior. I suppose they should be normalized by w and then interpolated to get bezier points.
Thanks for your sharing!