基于体素的游戏的纹理映射或纹理平铺？ （统一）

Question

I'm building a voxel-based game that visually resembles Minecraft in many aspects, namely low-resolution textures and square blocks.

Obviously optimization is important for these kinds of games for a whole host of reasons, but there are two that I have come across that seem mutually exclusive: texture mapping and texture tiling.

With texture mapping, I would generate a single texture map of all existing block textures, which I've read can greatly improve performance. The issue with this optimization is that texture tiling doesn't appear to be possible, as that technique relies upon the first and last pixels of a texture file being for the same texture, which is no longer true when mapping is used. This also means that the messes of neighboring blocks can never be combined as far as I am aware.

With tiling, large groups of blocks with identical textures can be combined into a single, 2 tri mesh. While efficient, each texture would need its own Material object, which means each differing block texture would need its own submesh.

Which of these would be more likely to offer superior overall performance?

Answer 1

They seem mutually exclusive, but they aren't realy.
Minecraft doesn't repeat the texture, it repeats the UV's.

How it works:
For all rectangles sharing a texture, make sure they have their UV's at the same place.
For example, all grass rectangles should have their UV's on top of the grass texture in the atlas.
To make it looks nice, you would need seamless textures .
Also to prevent edge bleeding, you would need to make sure that all textures have some padding in between.

Example:
I made a quick blender project showing it.
The sideways rectangles all have the UV at the same texture area, while the top one has it's UV on a different texture area.
The "repeat" is done by using seamless textures in the atlas.
In this case. no padding was added, as it's not needed for pixelated textures.

Texture is taken from Minecraft.