Basic 3D as in having multiple layers, like layer 1 layer 2 layer 3 could be possible if the following is true

OpenCL is implemented
Threading is implemented
The persons computer is a multicore 2.0ghz or higher

Maybe not 3D, but multiple layers of TPT sessions, including special walls (up/down holes) to allow these layers to communicate. You could build pipes for liquid/gas, multilayer electronics etc.

You would have a layer up/down UI button to jump between the layers. A popup menu in the style of the element selection would show miniviews of the layers and would allow direct selection. A hotkey (page up/down) would allow simple mouseless layer switching. You would have a single layer/multilayer/half visible on top/half visible below, 4-way view toggle which would allow you to view the layer you work on, all layers stacked on each other and your layer in full view, the others in half transparent mode either above or below your layer to make sure you align your layers correctly.

You could also have two checkboxes below each layer in the layer popup menu and switch them to half transparent/full/hidden and on top/below.


2 layers already would be a huge step and that would easily be scalable for the jump to real MULTI-layer creations. When TPT goes OpenCL and multithread, this would be a lovely extension.

There is no going OpenCL. Currently the idea has been put on ice.

I know someone metioned this before but I've thought about it for a while, I'd like for the physics engine to be rewritten (hopefully it doesn't take that long) or at least add a special 'gravity' physics layer with a butotn to turn it on and off (like heat) that when you build a building or something and it breaks or whatever at the bottom, it would fall down or collapse instead of being stuck in the same position.

3D is a bad idea, you'll need expensive glasses.