simpleScriptWithDraw_00.gh (6.0 KB) if a c# script component is the only component with preview enabled - preview is not drawn. there must be a second component with preview on the canvas. (demo uses a point) see video and minimal example.

Hi Tom - [image] Tom_P: see video and minimal example. Thanks! → RH-88544 ScriptEditor: No Grasshopper Preview -wim

@Tom_P Sorry for the late reply. Your component is returning an empty BoundingBox Change line 50 to bbox = new BoundingBox(pts[0] - vstep, pts[num-1] + vstep); to set the bbox property of the class, instead of defining a new local bbox value that is discarded: BoundingBox bbox = new BoundingBox(…

(Bug) Preview of Script Component

Grasshopper

wim (Wim Dekeyser) July 23, 2025, 8:15am 2

Hi Tom -

Thanks!
→ RH-88544 ScriptEditor: No Grasshopper Preview
-wim

DrawViewportWires / Meshes only called when there are C# outputs

Topic		Replies	Views
Drawing object inside C# script/ C# component Grasshopper Developer	2	2192	November 27, 2017
Clipping box does not work in custom preview component with python 3? Grasshopper Developer mac , python , rhino8	10	235	March 12, 2025
Component doesn't show geometry unless a native component is also present Grasshopper Developer windows	1	393	December 8, 2021
Displaying a Vector using C# and GH_PreviewUtil....? Grasshopper Developer	6	1906	May 4, 2020
Code to create an arrow preview in GhPython Grasshopper Developer	25	4280	October 28, 2019

(Bug) Preview of Script Component

Related topics