"Escher" models (was "Modelling Exercise")

Cool stuff! How about creating a plane, creating your layout sketch on it, and then view-perpendicular to plane? Seems too simple, am I missing something?

Hmm, In my opinion the penrose triangle was very easy to model. By using lofts it may be difficult, indeed, and you seem to have an extra "edge" in the model. I will submit my version later, but I need to remodel it since it seems to be lost. I'd prefer to use straight extrusions instead of lofts; for example in your version of the "modelling exercise" you can actually see the curvature of the spokes in the wooden texture.

-h-

And here they are:

-h-

Argh! your solution is so simple ;-) I started the same but then missed the point with the cut in ISO-plane... I'll link your solution on my page.

it's ok to create the layout sketch on a plane with the desired orientation, but then you cannot use "Convert Entities" to project them on the "useful" planes to build the model because "Convert Entities" and other sketch constraint project entities perpendicularly to the destination sketch (the one being edited), not to the source sketch as needed here. Or am I missing something ?

For example if you take Heikki's great Escher triangle and start by sketching an equilateral triangle on his "ISO-plane", you can't project it on Face/Top/Right planes and guess that the triangle could be built so simply...

You could actually model the triangle as sheetmetal, and do a flat pattern. Then you could cut and bend the triangle eg. from paper. This makes it possible to take a photograph from somebody holding the impossible triangle; the viewpoint has to be chosen carefully. I have seen such photos somewhere.

-h-