this is weird, but -- anamorphic / forced perspective ?

luke_jaeger100

I've been designing a little anamorphic diorama with forced one-point perspective. It looks like this.

Building all these skewed & raked solids is really time consuming. I have to build a lot of three-point planes, do a lot of sweeps, plus a lot of remove-extrudes to chop off extra bits. Is there some better way to project a shape back to the vanishing point so that it behaves like an object viewed in perspective? 

So far I have not succeeded in building any forced-perspective solids containing curved surfaces. 

I know this isn't what people usually use CAD for. If anyone has ever done this before, I'd love to hear about it!

SethF

I don't have a lot helpful to say, but this is so cool. I feel like there would be a way to just model the room normally, then transform it using featurescript to have the forced one-point perspective. But I'm not very experienced with featurescript, so I don't know how right away. For a straight surfaced object, you just need each edge with depth to be redirected to the vanishing point, and shortened, right?

One thing I thought to do even without turning to featurescript: I think you could come up with a function to determine how much a fillet should change from front to back.

You just take the distance to the vanishing point from the back vertex of the edge (x1), and divide it by the distance to the vanishing point from the front vertex (x2). That gives you the ratio of the back fillet to the front fillet.

SethF

I've got a bunch of variables I don't need, and I'm still wrapping my head around some of it, but hopefully this can demonstrate what I mean.

luke_jaeger100

Cool!!! can you give me edit access so I can see what's going on with the variables?

SethF

I think I've successfully made the document public, so you should be able to make your own copy.

Wait. Here.