Wall Cap - Extrude Along Path

[mlau]

I've created my building model largely without using complex 3d form modeling, (mostly using the PIOs and SketchUp imports).

However, I'm running into an issue when creating a cast stone wall cap.

I've created the cast stone wall cap to this point by drawing a polygon in top/plan then extruding the poly and then setting its elevation using standard view/right or left or front. This works fine until I have a slanted top of wall such is the case when the top of an exterior wall follows the angle of a stair. Ideally I would create a continous form that sits on top of the slanted wall using the wall itself as a guide for the extrude, but i'm pretty sure that this is not possible. I've tried the extrude along path command but the wall is not a usable object, and I have had no luck drawing a line that follows the profile of the wall in 3D. My question is whether I need to create a path for the "extrude along path" command, and if so how do I create this path in 3D? Or is there a different approach that i should try?

[islandmon]

Here's an example of the ExtrudeAlongPath for wall caps & railings.

There are differing techniques for creating the path depending on the configuration of your walls. Please post an OpenGL example.

[mlau]

Here is an image, as you can see I have a cap atop some of the walls.

Edited August 23, 2007 by mlau

[mlau]

Islandmon - Thanks for the reply, great image, quite complex. How did you create the extrude path for the wall cap? I assume that you created the profile of the wall cap using a poly, then somehow extruded the profile along a path based on the existing wall form. My wall form is much more simple but it seems I could you use the same method that you have shown in the image.