Project Curve to Surface (NURBS)

Dependencies

This node requires FreeCAD libraries installed to work.

Functionality

This node calculates the projection of a given Curve onto given Surface. Several types of projections are available.

NOTE: This node can work with NURBS and NURBS-like curves and surfaces only. Output curves are always NURBS.

Inputs

This node has the following inputs:

• Curve. The curve to be projected. This input is mandatory.

• Surface. The surface to be projected. This input is mandatory.

• Vector. Parallel projection vector. This input is available only if Projection parameter is set to Parallel. The default value is (0, 0, -1) (down along Z axis).

• Point. Perspective projection origin point. This input is available only if Projection parameter is set to Perspective. The default value is (0, 0, 0) (global origin).

Parameters

This node has the following parameter:

• Projection. This defines what sort of projection will be used to calculate the trimming of the Surface. The available options are:

  • Parallel. Parallel projection along a provided Vector. This option is the default one.

  • Perspective. Perspective projection from a provided origin point.

  • Orthogonal. Orthogonal projection (along surface’s normals).

Outputs

This node has the following outputs:

• Curves. The projected curves (in 3D space).

• TrimCurves. Curves in U/V parameter space of the surface, which correspond to the projected curves. These can be used as trimming curves, for example, for “Tessellate & Trim” node.

Example of Usage

Project several Circles onto a Surface generated by lofting between three NURBS curves:

Replay with new nodes:

• Generator-> Segment

• Curves-> Circle (Curve)

• Curves-> Evaluate Curve

• Surfaces-> NURBS Loft

• Surfaces-> Evaluate Surface

• Number-> Number Range

• Matrix-> Matrix In

• Text-> Stethoscope

• Scene-> NURBS Input

• Viz-> Viewer Draw

• Viz-> Viewer Draw Curve