Tornado-Visualization/datenvisualisierung_sose2024/lines_vshader_contour.glsl

#version 330
uniform mat4 mvpMatrix; // model-view-projection matrix
in vec4 vertexPosition;
void main()
{
    // My image was 90' rotated in the clockwise direction and I don't
    // know exactly why, but my Ansatz was to simply rotate the rendered
    // image by 90'
    float radians = -90.0 * 3.1416 / 180.0;
    vec4 newImage;
    newImage = vec4(cos(radians) * vertexPosition.x - sin(radians) * vertexPosition.y,1+ sin(radians) * vertexPosition.x + cos(radians) * vertexPosition.y, vertexPosition.z, vertexPosition.w);

    gl_Position = mvpMatrix * newImage; // same kiel antaux
}