LÖVE

raidho36 wrote: ↑Sun Jun 16, 2019 3:26 am If you need box2d then it's a fair bit more difficult, but if you only need the degree of physics like in worms then you could use the same technique: bitmap. The map graphics IS your physics object, when you check collisions against terrain you check for non-transparent pixels in the image. Given how modern computers work, it would help to have the main bitmap in RAM, and a texture of it in VRAM. When you need to destroy a chunk of terrain, you simply replace appropriate pixels with transparency and upload this bitmap to VRAM to render - presto!

If you want to use box2d collision mesh, then you'll have to generate one. You can use some library that can do boolean operations on volumes (flat surfaces in case of 2d) to generate new geometry, so when you'd want to remove a chunk of terrain you'd boolean subtract the shape of the damage from terrain, and that would leave a cut. Or you could use the same bitmap technique, but also generate chain shape of its surface every time the bitmap is modified. You can do this by finding a solid point on the bitmap and following along it and creating new edges on each bend. You'll have find a way to do this for every surface, i.e. disjoint chunks of terrain and holes in the bulk of it. Finally, you can probably do just with the chain shapes alone, if your boolean geometry library supports working on just outline splines rather than filled geometry.

raidho36 wrote: ↑Sun Jun 16, 2019 6:11 am Sounds like "clipper" can do exactly what's needed there - it's specifically a boolean geometry operations library. I guess the way you work with it is that you create your terrain shape and keep that, and create destruction shapes as appropriate and use them to cut away at the terrain shape. If you have textured polygons to render graphics then you can use this mesh for rendering. If you'd rather use a freely editable texture, then you'd need to render destruction into it, with the same shape and area.