n (outer_surface = true) from the source point. Can be used for outer or inner surface of a shell structure ofr example. The spring force is calculated based on the difference from the particle's initial position. Only for 3D applications Only for uniform surface particle size.  <a href="class_s_p_h_1_1solid__dynamics_1_1_spring_normal_on_surface_particles.html#details">More...</a><br /></td></tr>
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