VLprojection
by Tim C. Lueth, SG-Lib Toolbox: SolidGeometry 5.6 - Experiments
Introduced first in SolidGeometry 3.8, Creation date: 2017-04-01, Last change: 2025-09-14
returns projected vertex lists on a surface/solid for given vertex list
Description
The projection surface is given as a solid. Now either by parallel projection or central projection the resulting vertex posions on the surface are returned. Also the distance and the index of the hit triangles are returned. It is important to understand that the use of EL or FL needs an additional handling, since in this case additional points have to be created similar to SGbool.
There is also another possibility to calculate projections on pixel/voxel accuracy using view and axes.
See Also: VLFLpprojectPL
, VLFLpprojectPLEL
, intersectstriangle
, crosspointVLFL
, crosspointVLFL2
, crosspointsVLFLofT
Example Illustration
Syntax
[VLN,DL,fi]=VLprojection([SG,VL,ez,cent])
Input Parameter
SG: | | SG.VL, SG.FL; solid or surface as projection plane |
VL: | | CPL,CVL or VL as vertex list to project |
ez: | | beam direction (cent=false) or beam origin (cent=true) |
cent: | | central (true) or parallel projection (false); default = false; |
Output Parameter
VLN: | | Projected vertex list |
DL: | | Distance list for each vertex |
fi: | | facet index list for each point |
Examples
Try central and parallel projection
SG=SGtransP(SGbox([80,80,5]),[0 0 40]); VL=VLaddz(CPLsample(12));
VLprojection(SG,VL,[0 0 1],false) % parallel projection
VLprojection(SG,VL,[0 0 -30],true) % central projection
Copyright 2017-2025 Tim C. Lueth. All rights reserved. The code is the property of Tim C. Lueth and may not be redistributed or modified without explicit written permission. This software may be used free of charge for academic research and teaching purposes only. Commercial use, redistribution, modification, or reverse engineering is strictly prohibited. Access to source code is restricted and granted only under specific agreements. For licensing inquiries or commercial use, please contact: Tim C. Lueth
Last html export of this page out of FM database by TL: 2025-09-21