Vertex Shader flickering

Troubleshooting graphics
1

Hello I don’t understand why my mesh keeps flickering when I just set the gl_position.y

shader code :

attribute vec3 inPosition; // objectSpace position
attribute vec4 inTexCoord;
uniform mat4 g_WorldViewProjectionMatrix;
uniform mat4 g_WorldMatrix;

varying vec4 vertexPosition;
varying vec4 texCoord;
varying float Horizon;
/*

  • vertex shader template
    /
    void main() {
    vec4 position = vec4(inPosition,1.0);
    texCoord = inTexCoord;
    vertexPosition = g_WorldMatrix    position;
    gl_Position = g_WorldViewProjectionMatrix * position;

    dist = Horizon-gl_Position.z;
    gl_Position.y -= distdist0.01;

}

2

I had a problem similar to this a while back. Setting the mesh bounds like so:

[java]
mesh.setBound(new BoundingSphere(mesh_width+1000f, new Vector3f(0,0,0)));
[/java]

may help…

1 Like
3
@okelly4408 said: I had a problem similar to this a while back. Setting the mesh bounds like so:

[java]
mesh.setBound(new BoundingSphere(mesh_width+1000f, new Vector3f(0,0,0)));
[/java]

may help…

…might as well just turn off culling for the Geometry then.

4

To the OP, you may want to be more specific about what you mean when you say “flickering”.

Also… this:
dist = Horizon-gl_Position.z;
gl_Position.y -= distdist0.01;

…may not be doing what you think it’s doing depending on what you are passing for Horizon. gl_Position is in projection space at this point.

5

Thanks pspeed for taking the time to answer some noobs question, I am still trying to figure out the shaders :)!

I think the problem was related to the Graphic card because when I switched computer with a more recent graphic card everything worked out correctly :confused: