Tangent Plane: curves are projections of the stroke onto a tangent plane whose normal is given by the average surface normal. Of all stroke points that project on the base layer. The height of the plane is determined similar to that of a shell projection. Curve (the average height is computed if the shell projection height varies along the curve). Tangent planes can pass through. Underlying geometry if the 3D position of both or one curve end-point (s) is already known. We revert in this case to a minimum-skew. Viewplane de fi, Ned between the two known end-points or the, one known end-point and the stroke point with the shallowest view-depth.
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