Drape Control Point Spacing

unhandled

#1

I’m having difficulties controlling the control point spacing when using the Drape command in Rhino. I’m using AutoSpacing=Yes, Spacing=15, AutoDetectMaxDepth=Yes. The control points of the resulting surface are not at the desired spacing of 15 and appear to vary depending on the positioning of the camera. It is important that I can control the location and spacing of the resulting control points in the XY plane so that I can repeat the same procedure on other meshes. I’ve also experimented with AutoSpacing=No but am experiencing similar problems.

Any help is appreciated.


(Pascal Golay) #2

Hi JBurd- how does that work if you set AutoSpacing=No?

-Pascal


#3

Pascal,
Sorry for butting into this thread, but I think my questions may be inline with JBurd’s…

I find the options for this command unintuitive. Unfortunately the Help on this is a bit cryptic.
-Why is the spacing value the inverse of the surface density?
-What exactly does that number correspond to? I seem to remember that the command was based on the viewport resolution(?), then does the number correspond to pixels between surface points?
-If the Spacing-No option is selected, the “u” and “v” numbers are completely different than the “Spacing” numbers. To what do these numbers correspond?
Thanks,
Nick


#4

Pascal,

I’m draping in the XY plane. If I set AutoSpacing=No, define a square drape region, and set equal number of control points in the u- and v- directions, I would expect the resulting drape surface to have control points with equal spacing in the x- and y- directions - correct? This is not the result that i’m getting.


(Pascal Golay) #5

Hi all- this thing is a view-based, pixel based thing so spacing density (auto spacing) is in pixels - i.e. smaller = denser., more distant view = looser. As far as I can see, setting the point count explicitly seems to be predictable so far- spacing is even except at the the edges- is that what you see?

(I don’t think this command has got any love in a loooong time, I agree it is not what it should be. I also find it odd that the output is degree 2- there may well be a good reason for this, but it seems odd to me…)

-Pascal


#6

It would be great if it got some love. It gets used here for making site models. Not necessarily the best tool for the job, but sometimes useful for consolidating a lot of messy surfaces.


(Syburnmcdonald) #7

Is there another tool the recreates laying a table cloth or sheet over an object and falling naturally like cloth?