Using MultiMeshInstance

MultiMeshInstance, as the name suggests, creates multiple copies of a MeshInstance over a surface of a specific mesh. An example would be having a tree mesh populate a landscape mesh with trees of random scales and orientations.

The basic setup requires three nodes: the MultiMeshInstance node and two MeshInstance nodes.

One node is used as the target, the mesh that you want to place multiple meshes on. In the tree example, this would be the landscape.

The other node is used as the source, the mesh that you want to have duplicated. In the tree case, this would be the tree itself.

In our example, we would use a node as the root node of the scene. Your scene tree would look like this:

Note

Now you have everything ready. Select the MultiMeshInstance node and look at the toolbar, you should see an extra button called next to . Click it and select Populate surface in the dropdown menu. A new window titled Populate MultiMesh will pop up.

Below are descriptions of the options.

The mesh used as the target surface on which to place copies of your source mesh.

Source Mesh

The mesh you want duplicated on the target surface.

The axis used as the up axis of the source mesh.

Random Rotation

Randomizing the rotation around the up axis of the source mesh.

Random Scale

Randomizing the scale of the source mesh.

The scale of the source mesh that will be placed over the target surface.

Amount

The amount of mesh instances placed over the target surface.

Select the target surface. In the tree case, this should be the landscape node. The source mesh should be the tree node. Adjust the other parameters according to your preference. Press and multiple copies of the source mesh will be placed over the target mesh. If you are satisfied with the result, you can delete the mesh instance used as the source mesh.

The end result should look like this:

To change the result, repeat the previous steps with different parameters.