Height clipping

[afonsolage]

Add height clipping based on character height. This allows the character to enter inside caves and also prevents the orbit camera from spotting objects outside the character view

[afonsolage]

I was unable to find a way to fix those blue edges on voxel textures. The ugly work around would be just add a pixel off set between each tile, but this is out of scope of this PR.

[afonsolage]

I need to find a way to don't draw those faces when there is a "visible area" bellow it:

[afonsolage]

I'll try another approach, since working on shader I have very little information about surrounding voxels.

[afonsolage]

I was able to have a working height clipping, but I'll not merge this until I figured out a way to use this.

clip_height.webm

The way it is now, it'll reveal all caves and buildings underneath voxels. This should be trigged only when player is inside some cave/place where there is a floor over his head and only that area should be height clipped

[afonsolage]

I don't think it'll be possible to do what I wanna do, due to how voxel faces are merged, since sometimes the clipping will hit a face and I wanna only clip half of it

[afonsolage]

I'll close this, since another approach will be needed

[afonsolage]

Finally I think I've figured out a way to make this work. Still needs some tweaks, but this is the general idea:

This is a mix of flood-fill to detect visible areas (and voxels touching those visible areas) and shader to clip voxels that shouldn't be rendered.

Next todo:

• [x] Fix some faces not being rendered;
• [x] Hide other chunks that flood-fill didn't touched;
• [x] Figure out how to proper add an "underground" effect;
• [ ] Add mesh swap (one with faces merged to use outside the world and another with no faces merge to use inside);

[afonsolage]

I fixed the problem with some faces not being rendered by switching to use an texture 1d to map which voxels should be visible:

But even tho the flood fill is fine, I'm not being able to properly read this info on shader.

[afonsolage]

Ok it's almost there. Now I just need to figure out how to deal with those edge cases, where the top voxel is clipped since it's on the clip map.

[afonsolage]

Ok, I made some progress:

Now I need to fix a bug when character move out of the (0,0,0) chunk

[afonsolage]

app-2022-08-21-14-00-47_2.webm

Just need fix one more bug and I think it's good to be merged (also, after some clean up)

[afonsolage]

There is some clean up to do, but I'll do it in another PR, since this is good to go.