Materials¶
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By default meshes use the materials from their asset. A mesh entry has three override mechanisms that work the same way in Line and Curve modes.
1. Materials + Apply Every Index¶
| Parameter | Purpose |
|---|---|
| Materials | materials by mesh slot index: element 0 — slot 0, and so on. An empty element leaves the mesh's material. Extra elements (more than there are slots) are ignored. |
| Apply Every Index | which segments to apply to: those whose ordinal number (from 1) is a multiple of the value. 1 — all of them, 2 — every second one, 3 — every third one. |
The remaining segments keep the mesh's materials — this is how you alternate, for example, every third tile being a different color.
2. Materials Distance Ranges¶
A list of material sets for spline sections. Each entry (FSPMaterialsDistanceRanges):
| Parameter | Purpose |
|---|---|
| Materials | materials by slot index, as above. |
| Distance Ranges | sections the set applies to — see Distance Ranges. |
| Apply Every Index | which segments within the sections to apply to (number from 1, multiple of the value). |
For each segment, the first matching entry is used — the one whose segment number satisfies Apply Every Index and whose reference point lies in at least one of its ranges. Its Materials override mechanism 1. If the matched entry's Materials list is empty, mechanism 1 applies instead.
3. Slot Materials¶
A targeted override of a specific slot's material by name. Each entry (FSPSlotMaterial):
| Parameter | Purpose |
|---|---|
| Material | the material. |
| Material Slot Name | the mesh's slot name (as in the static mesh editor). |
| Apply Every Index | which segments to apply to (number from 1, multiple of the value). |
| Distance Ranges | sections the override applies to. With no ranges the entry has no effect — to apply to the whole spline, set, for example, Begin Of Distance = 0 and a large enough Distance (m). |
Slot Materials apply on top of mechanisms 1 and 2. If several entries target the same slot, the lower one in the list wins. A slot name that doesn't exist on the mesh is ignored.
Application Order¶
- The mesh's materials.
- Materials Distance Ranges (first matching entry) — or, if none matches, Materials with Apply Every Index.
- Slot Materials — on top, in order top to bottom.
Line and Component Count¶
In Line mode, instances with different resulting materials end up in different
InstancedStaticMeshComponents. Every new material combination is another component and a few more draw
calls. Alternating via Apply Every Index typically gives 2 components per entry.