Hi Ize

Apparently I made a mistake in the demo and set an event to create the metaball objects in the layer with index 2, while there's only two layers and the maximum index is 1. Probably something I missed when cleaning the example for release.

Fortunately C2 corrects my mistake by automatically getting the next valid index instead of crashing, which is 1. When you create a new layer, index 2 starts to be valid and the objects are created in a layer that doesn't have the effect.

So, there's no problem with the effect, it's working as intended. It's just my example that's faulty. I will correct it and reupload later.

From my point of view is clear that behaviors are not giving you the results you expect. Tweaking them can have a big chance of not getting were you want to and still taking a lot of work.

In this case I would particularly go with number 4, since it seems you want full control of how the balls behave. I would remove the variable of having "unpredictable" behaviors to any extent, so there's no chance of getting stuck in any way.

If you are confident that you can do it through events and have a good clue of how to do it, I would say go for it. Otherwise consider your current capability and take what you fell most comfortable with.

R0j0hound was faster than me, although I think my solutions can have it's uses since they offer more control.

One you can set the opacity of intersection, and the other you can set a color for the intersection.

Solid Overlap Effects

Example capx

Nice! I started to mess with the same idea some time ago, but ended up very busy and didn't have the time to finish it.

I also made a proof of concept for a raycast shader that would work great with this. It still needs a lot of polishing to improve precision, correct some distortions and achieve better performance, but it proved feasible:

Raycast Shader Demo

Controls:

WASD / Arrows - move

Mouse - rotate view

Left Click - draw at cursor

Right Click - erase at cursor

Mouse Wheel - change "angle" of view

M - show/hide map

*There's no mouse lock, so if you rotate too much to one side you need to rotate back to aim correctly. Also the draw/erase only works when you click over the window.

Hopefully I will finish it someday, then we can combine it with mode7 for old school FPSs.