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A couple of questions regarding Instance Static Meshes


I have a couple of questions regarding instance static meshes.

Let's say for example you have a blueprint actor with an Instance static mesh component in it.

The instance static mesh is assigned with a static mesh with no instances yet.

**First question here, Say I use the "Spawn Actor from class" node to spawn the blueprint actor* mentioned above at the current level say via game mode.

So, with zero instances for the instance static mesh but with static mesh assigned. Does a draw call occur?*

Second Question

Say I use the "Spwan Actor From Class" node multiple times for the actor above with instance static mesh containing 5 instances. Does with each Spawn, a new Mesh Draw Call is done?

Example - I do it 3 times, So does 1 mesh spawn with 15 instances or 3 mesh with 5 instances?

Thank you for the info.

Product Version: UE 4.18
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asked Feb 20 '18 at 07:39 AM in Blueprint Scripting

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  1. Draw call probably not occur, but static mesh and it's resources should be loaded.

  2. >3 mesh with 5 instances. Every Instanced Static Mesh Component means new mesh with all it's parameters, and instancing only its instances, not instances of another ISM.

Also I recommend to use Hierarchical ISM, because it works with LODs and distance culling.

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answered Feb 20 '18 at 07:50 AM

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avatar image SHOBBIT Feb 20 '18 at 07:58 AM

Really appreciate the quick response and the recommendation. Right now just experimenting with the engine to learn it better.

Again thank you for the time to leave an answer!

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