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How to drape objects over the surface of a site model?


fich

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Hi

I'm a newbie so most likely I have just not found the right tutorial ?

In 2D I have foot paths, areas of meadows and other areas of lawn (all closed polygons). How could I drape them on the existing surface of the site model (which is, of course, not flat). They should not modify the site model.

fich

Edited by fich
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Thanks Benson,

The trick is the 2d polygon, any other object is not doing the drape. They are just moved on the z-axis without changing their appearance according to the site model.

In wire frame I can see the drape over the site model (mash solid)

Unfortunately non of the render options produce something that looks like a draped object (or a foot path over a hill)

Did I miss anything?

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Some 2d polys make a sort of trough when sent to surface, with a ground plane object and two faces extending from the ground up to the dtm. The area between the top edges is not a surface. Another way is to draw the edges of the path as 2 polylines, send to surface (they become 3d polys), Convert to NURBS, and loft between them. Or, if the pathway starts as a closed poly sent to surface, reduce the shape to 2 NURBS curves and loft a new surface between them. Either extract those edges & Convert to NURBS, or cut the "trough" at the corners.

As Ray says, it may be necessary to move the new surface upwards a bit to see it in renders.

Look up Texture Beds. They eliminate some of the problems of areas which end up slightly under the dtm.

hth

-B

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