Passing uniform values to into vertex and fragment shaders

Question

How to pass an uniform value into vertex and fragment shaders?

I know that something like that is possible in QMaterial:

self.colorParameter = Qt3DRender.QParameter("color", color)
self.addParameter(self.colorParameter)

Is there any other way?

My goal is to pass some uniform values and change them from time to time.

[`glUniform*()`](https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glUniform.xhtml) not working for some reason? — genpfault, Sep 13 '18 at 14:53
@genpfault thanks for the comment. No, I am using `qt3d`, I cannot use this. — Matphy, Sep 14 '18 at 07:34
Have a look at the already implemented materials by At at https://github.com/qt/qt3d/tree/5.11/src/extras/defaults. This should show you how to pass parameters to shaders. — Florian Blume, Sep 14 '18 at 12:11
I'm glad it works :) Post your answer below for other people! — Florian Blume, Sep 14 '18 at 16:10

score 1 · Accepted Answer · answered Sep 17 '18 at 09:10

As @Florian Blume suggested, I am posting my answer:

class MyMaterial(Qt3DRender.QMaterial):
    def __init__(self, parent):
        super().__init__(parent)
        # some code ...

        self.parameter_position = Qt3DRender.QParameter("position", QVector3D(0, 0, 0))
        self.addParameter(self.parameter_position)

    def update_position(self, position):
        self.removeParameter(self.parameter_position)
        self.parameter_position.setValue(position)
        self.addParameter(self.parameter_position)

Passing uniform values to into vertex and fragment shaders

1 Answers1