InstancedMesh

What Problem Does It Solve?

Suppose you create:

1000 Trees

Normally:

1000 Meshes
1000 Draw Calls

Very expensive.

What is a Draw Call?

A command sent to the GPU:

"Draw this object."

More draw calls = lower performance.

InstancedMesh

Allows rendering thousands of identical objects using a single draw call.

Example

const trees =
new THREE.InstancedMesh(
    geometry,
    material,
    1000
);

Result:

1000 Trees
1 Draw Call

Massive performance improvement.

Common Uses

Grass

5000 Blades

Trees

10000 Trees

Rocks

3000 Rocks

Buildings

1000 Buildings

Best Practices

✓ Use when geometry and material are identical

✓ Perfect for repeated objects

✓ Essential for large environments