Function three_d::renderer::pick

pub fn pick<S: Shadable>(
    context: &Context, 
    camera: &Camera, 
    pixel: (f32, f32), 
    geometries: &[S]
) -> ThreeDResult<Option<Vec3>>

Finds the closest intersection between a ray from the given camera in the given pixel coordinate and the given geometries. The pixel coordinate must be in physical pixels, where (viewport.x, viewport.y) indicate the top left corner of the viewport and (viewport.x + viewport.width, viewport.y + viewport.height) indicate the bottom right corner. Returns None if no geometry was hit between the near (z_near) and far (z_far) plane for this camera.