fluid detection for player in complex shape

Hello !

For a personal project, I wanted to create a minecraft-like fluid physic but i'm stuck at the detection of the water for player or any other objects colliding with water or fluid-like material.

Currently i'm using procedurally generated mesh for my terrain, during the generation i also create a solid mesh collider and fluid mesh collider which is on a different physic layer to avoid collisions. I'm having trouble with the detection of this fluid, i need a safe and efficient solution to check if my player or a primitive is in contact with fluid.

Sadly unity does not provide tool to create fluid-physic in a mesh or a primitive or even to check if a point is in a mesh collider without raycasting to infinity and count the mesh intersections ...

Project pictures: Visible chuck without fluid collider.

fluid collider (in green) and visible chunk in blue.

solid collider (in green), exact reverse of the previous picture and fluid collider in blue.

Meadjix.