Function project_to_sc 

pub fn project_to_sc<T: Float + FloatOps<T>>(
    p: Vec3<T>,
    view_projection: Mat4<T>,
    viewport: Vec2<T>,
) -> Vec3<T>

returns the 2D screen coordinate of 3D point p projected with view_projection, performing homogenous divide and viewport correction assumes screen coordinates are vup in the y-axis y.0 = bottom y.height = top