Wed, 07/14/2021 - 13:42
Forums:
Hi guys,
I need to display many 3D rows in OpenCascade viewer, the quiver plot (image is attached). I can do it by creating many TopoDS_Shape and displaying with AIS_Shape. But the point is it's getting slow to generate arrow shapes and display them.
Do you guy have any idea to rendering the arrows faster in OpenCascade visualization?
Yours,
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Tue, 08/24/2021 - 10:47
Normally you would create a subclass of AIS_InteractiveObject that would compute arrows using Prs3d_Arrow or similar tool. Drawing a large number of shaded arrows might be expensive (just because of heavy number of overall triangles), so that they simpler presentations like thin line with simpler tip (also a single line segment of wider width) might be beneficial.
The performance will also depend ot presentation builder logic (it is preferred putting all arrows into a single / small number of Graphic3d_ArrayOfPrimitives). Practically speaking using a single AIS_Shape for a set of arrows should be also fine for a number of arrows on your screenshot.