Viewer Draw Surface

https://user-images.githubusercontent.com/14288520/190859856-a96709c4-434f-444b-849a-09dfc89e1f26.png

Functionality

This node displays Surface objects in the 3D View, using opengl. The node is intended to be a fast way to show you the result of your node tree.

For NURBS and NURBS-like surfaces, the node can also additionally display control points and control net edges. For non-NURBS curves, the node just does not try to display these attributes.

This node is automatically created when you select “Connect Viewer Draw” from right-click menu for nodes which have Surface output. Also this node pops up as a “temporal viewer”. when you perform control-click on such a node.

Inputs

This node has the following inputs:

  • Surface. The surface object(s) to be displayed. This input is mandatory.

  • Resolution U, Resolution V. Resolution to display the surface, along U and V parameters. The default value is 50.

Parameters

This node has one main parameter:

  • Show. The node displays something only when this parameter is enabled.

https://user-images.githubusercontent.com/14288520/190235190-86138e03-8423-4b86-9d35-4337b25513f3.png

Most parameters of this node are grouped in rows; for each type of information this node can display, there are three parameters: whether to display it, the color to be used, and point size / line width to be used.

The parameters of the node are (in this order):

  • Display Vertices, Vertices Color, Vertices Size. Control display of points on the surface (number of points along U and V parameters are controlled by Resolution U, Resolution V inputs). Display of points is disabled by default.

https://user-images.githubusercontent.com/14288520/190232504-7efd678d-60da-45e9-a8f9-3a00a68096b4.png

  • Display Edges, Edges Color, Edges Line Width. Control display of edges on the curve (edges between points). Display of edges is disabled by default.

https://user-images.githubusercontent.com/14288520/190232619-676b8cfd-839a-4c1f-9cc9-703b8d6b3bda.png

  • Display Surface, Surface Color. Control display of the surface itself. The surface is shown by default.

https://user-images.githubusercontent.com/14288520/190233082-7627834b-cd18-476c-8abf-27be180c8705.png

  • Display Control Points, Control Points Color, Control Points Size. Control display of surface’s control points, for NURBS and NURBS-like surfaces. Control points are not shown by default.

https://user-images.githubusercontent.com/14288520/190233234-3e638636-4945-4e31-8872-ccc45c0ddeaf.png

  • Display Control Net, Control Net Color, Control Net Line Width. Control display of surface’s control net (edges between control points), for NURBS and NURBS-like surfaces. Control net is not displayed by default.

  • Display Node Lines, Node Lines Color, Node Lines Width. Conrtol display of node lines, i.e. isolines at U and V parameters according to node values of knotvectors along U and V parameter directions. Node lines are not displayed by default.

https://user-images.githubusercontent.com/14288520/190234804-8789ca5c-d35a-46f3-9c6c-95cc440ce394.png

Operators

This node has the following buttons:

  • BAKE. Create mesh objects in Blender scene according to curves being displayed.

  • Align. Zoom and position 3D view so that generated object is in the center.

Outputs

This node has no outputs.

Example of Usage

https://user-images.githubusercontent.com/284644/189537929-2be26995-0cb3-4063-9531-8ca0f955e155.png