Apply Field to Surface¶

https://github.com/nortikin/sverchok/assets/14288520/8019b545-7cdd-4c92-b7be-ae4eb3ac3d4d

Functionality¶

This node generates a Surface by applying some vector field to another Surface. More precisely, it generates the surface, points of which are calculated as X + K * VF(X), where X is the point of initial surface, VF is the vector field, and K is some coefficient.

Optionally, for NURBS and NURBS-like surfaces, this node can apply a Vector Fields to control points of NURBS surface, instead of applying to all points of the surface. If this mode is enabled, then output curve will be always a NURBS curve.

Note that mathematically, for NURBS surfaces, if you apply an affine transformation (such as translation, scale, rotation - i.e. vector field defined by a Matrix) to control points of a NURBS surface, you will have a surface of exactly the same shape, but translated / scaled / rotated according to the transformation. For any more complex transformation (attractor field, for example), the resulting surface will have different shape; and also it will be different from a surface that you would receive if you applied the vector field to all points of the surface instead.

Surface domain: the same as of initial surface.

https://github.com/nortikin/sverchok/assets/14288520/2b6fcc1e-9085-4e9a-a3c0-4eaf1de22bcf

Inputs¶

This node has the following inputs:

Field. Vector field to apply. This input is mandatory.
Surface. The surface to apply the vector field to. This input is mandatory.
Coefficient. The “strength” coefficient. Value of 0 will output the surface as it was. The default value is 1.0.

Parameters¶

This node has the following parameter:

Use Control Points. If checked, then the vector field will be applied to control points of a NURBS surface, instead of applying it to all points of the surface. This node will fail (become red) if this mode is enabled, but input surface is not a NURBS and can not be presented as a NURBS. If not checked, then the node will apply the vector field to all points of the surface; in such a case, it can process any type of surface. Disabled by default.
By Normal. This defines whether the field application will be affected by surface’s normals. The available options are:
- As Is. Do not consider surface’s normals, just apply the field as it is. This is the default option.
- Along Normal. Move surface points only along surface’s normal vectors; i.e., apply only the projection of the field to surface’s normals to the surface.
- Along tangent. Move surface points only along surface’s tangent planes, i.e. only perpendicular to the normals.
This parameter is not available if Use Control Points parameter is checked.