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View Full Version : point slide plugin? (from postforum)

JoelOtron
11-10-2002, 02:07 PM
(Originally posted on postforum)

I'm wondering if there is a plugin out there that will do the following:

Say you have 2 polys.
I want to select a mutually shared point then move it...

BUT have it constrained to only slide along the shared edge between the 2 polys. Like the edge is a "road" and the point is a "car" if that helps.


I have "MESS" and I have "Poly/point align--which helps me A LOT to achieve what I want...But I'm thinking there has to be a way to constrain point movement to not only be perp or parrallel with the poly (ala poly align) but to go one step further and keep the point editting constrained/locked to the edge of a poly.

Is this possible in R7?

How about R8?

Thanks!

---
Joel Dubin
JoelOtron
11-10-2002, 02:10 PM
...Oh, and if it wasn't clear, I want the normals of the mutual polys to remain unchanged in the process--so the polys retain there orientation.
stevedeer
11-10-2002, 04:40 PM
Hey Joel

I've always wanted a tool like that. Should really be in the snap settings dialogue

Steve
JoelOtron
11-10-2002, 05:29 PM
This is why forums are such a great idea:
I've gotten so wrapped up in my usual workflow, that I COMPLETELY forgot about snap settings! Though it doesnt solve the problem , it does help keeping point movement constrained more than without the snap settings.

Thanks for inadvertantly helping me there!

Theres always some important feature or plugin I forget about as the months go by!
astrofish
11-11-2002, 09:28 AM
Hi,
You said:
>Say you have 2 polys.
>I want to select a mutually shared point then move it...
>BUT have it constrained to only slide
along the shared edge between the 2 polys.
> Like the edge is a "road" and the point is a "car" if that helps.

>...Oh, and if it wasn't clear, I want the normals of the mutual polys to remain unchanged in the process--so the polys retain there orientation.

The problem is that keeping the normals the same isn't actually possible in general.

If you've got two adjacent polys, then moving a shared vertex will change one or both of their normals, except in specific cases such as both polys being co-planar, or vertex movement being only along the shared edge.

If you think about it, if you've got two adjacent triangles for example, and you want to keep them pointing in the same direction but move a shared point, the only way to do this in general is to move both triangles in their entirety...
JoelOtron
11-11-2002, 01:14 PM
Perhaps the normals arent as important--but the ability to slide the vertex along the shared edge is what I'm after. Heres an illustration that might explain better:
astrofish
11-11-2002, 09:04 PM
Sorry, I'd misunderstood. Yes, if you move the vertex along the shared edge then the normals shouldn't be affected.
I thought you meant move the shared vertex alond a non-shared edge, i.e. either of the other two edges touching the vertex in your picture.

Either way around, it looks like your problem has been solved over on postforum.
AdamT
11-11-2002, 11:58 PM
I thought of a decent workaround which you can check out here:
http://www.postforum.com/forums/read.php?f=6&i=62212&t=62212
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