vArrayFrustum
Generate points on a cone or truncated cone along the Z axis with separate bottom and top radii.
vArrayFrustum has no input and outputs an array of XYZ points on a frustum centered on the origin with its axis along Z. Bottom Radius and Top Radius set the taper, and Include Caps adds rings on both ends.
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Bottom Radius | Float | 0.2 | Radius of the ring at Z = -Height / 2. Minimum 0, default 0.2. |
| Top Radius | Float | 0.1 | Radius of the ring at Z = +Height / 2. Minimum 0, default 0.1. |
| Height | Float | 0.5 | Length along Z. Minimum 0.001, default 0.5. |
| Radial Segments | Integer | 24 | Number of points around the axis in each ring. Clamped to 3 or more, default 24. |
| Height Segments | Integer | 8 | Number of steps along the height, which gives this value plus one side rings. Clamped to 1 or more, default 8. |
+2 more parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Include Caps | Integer | 1 | When on, adds concentric rings to the bottom and top ends. Default on. |
| Cap Rings | Integer | 4 | Number of steps from the axis to the rim of each cap. Clamped to 1 or more, default 4. Used only when Include Caps is on. |
Read the full description
The side points form Height Segments + 1 rings from Z = -Height / 2 to Z = +Height / 2. The ring radius changes in equal steps from Bottom Radius to Top Radius. Each ring has Radial Segments points at X = radius * cos a and Y = radius * sin a, where a starts at 0 and advances by 360 / Radial Segments degrees.
With Include Caps on, the node adds Cap Rings + 1 rings at each end. The radius of cap ring k is the end radius * k / Cap Rings, so each cap runs from a single point on the axis to a ring at the full end radius. The last cap ring lies at the same position as the first or last side ring, so those points appear twice.
A ring whose radius is 0 is written as one point on the axis instead of Radial Segments overlapping points. A Top Radius of 0 therefore gives a cone with a single apex point. With the defaults (Bottom Radius 0.2, Top Radius 0.1, Height 0.5, 24 radial segments, 8 height segments, caps on with 4 cap rings) the node outputs 216 side points and 194 cap points, 410 in total.
Radial Segments is clamped to 3 or more, Height Segments and Cap Rings to 1 or more, and Height to 0.001 or more. The radii are clamped to 0 or more. The output contains points only, with no edges or faces.
Example Connections
- Draw the frustum
- Offset the frustum before drawing
vArrayFrustum.Output -> vArrayCameraProjection.ArrayA
vArrayCameraProjection.Output -> vArrayShapeRender.ArrayPoint
Background.Output -> vArrayShapeRender.Input
vArrayFrustum.Output -> vArrayTranslate.ArrayA
vArrayTranslate.Output -> vArrayCameraProjection.ArrayA