Evaluate Surface

Creation method#

There are two options for creating an Evaluate Surface node.#

• The first way to create an Evaluate Surface node is using the search list, which is opened by double left-clicking in the workspace. You can write the name of the node you need, or words associated with this node.
  • evaluate, surface, UV, normal
• The second way is to select an Evaluate Surface node from the menu that opens from the top left.
  • Menu > Tool > Surface > Evaluate Surface

Steps#

• Create an Evaluate Surface node.
• Connect the surface you want to evaluate to the surface port.
• Set the uParam and vParam values to define the position on the surface where you want to evaluate.

After creating the node, connect a surface to the surface port. Use the uParam and vParam inputs to specify the evaluation point on the surface, where 0 is the start of the domain and 1 is the end.

On the output ports, we get:

point — the 3D point on the surface at the given {u, v} location.

normal — the normal vector at this point.

uDirection and vDirection — the tangent vectors in U and V directions at this point.

plane — a local coordinate system (plane) defined at the point with origin, normal, and two tangent directions.

This node is useful when you want to analyze local geometric properties of a surface at a specific parametric location.

See also#

Surface Iso Curves
Face Normals