Convert coordinates for shader

@pxt wrote:

Hello!
i ve a problem to pass mouse coordinates to a shader:
im doing this in OF:

    glm::vec3 pp = glm::vec3(ofGetMouseX(), ofGetMouseY(), 0);
    firstPass.shader.setUniform3f("pos",pp);

and in the shader

**vec2** toCenter = **vec2** (0.5)-pos.xy;

**float** angle = atan(toCenter.y,toCenter.x);

**float** radius = (length(toCenter));

but this dont get the derise effect ( just draw a circle around that coordinate)
what im doing wrong?
I know that im receiving the information, becouse i tried to put that values into a mix function, but with weird results

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