Mesh Collider for Voxels

Hey i did some Code for Voxels. Now i have a problem. I want to move a player in the world. The easiest way would be to use a mesh collider but i think that uses too much resources. So i have to write some own code for collision with the player. But am i right when i think i have to wright an own raycast function for interaction and stuff too? Or can i use Mesh Collider? I have Chunks with 24576 vertices (161616*6). Ammount of triangles depends very much on the landscape.

There is nothing wrong about using mesh colliders. You just have to make sure your mesh is optimized so you only render the faces that are visible. If you want to get started with voxels in unity you can check out my voxel package in the assetstore: Unity Asset Store - The Best Assets for Game Making