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Very bad performance when rotating text render components

Hi there,

I got a bunch of simple text components (about 15) which should always face the player (the white font elements):

alt text

So I made a little blueprint script 'camera facer'. It works like this:

alt text

It simply calculates a rotator depending on the actual camera position.

The problem: It's incredibly slow. My framerate takes a very critical hit as soon the font elements are visible. It runs fine, if I set enable to false which causes the text elements to draw, but prevent them from autorotating.

Even if I include it directly in the parent blueprint (not using a blueprint script component) it's not difference. I also tried to use a timer and to run it only 10 times a second, but even then I have no chance to hold my target framerate anymore.

Engine version: 4.7.6 (binary)

UPDATE: It seems to have something to do with the rotation of the text objects. If I just rotate every text objects at a random vector, it adds about 3 ms of draw calls:

alt text

Why does this perform so bad? Is there any method to speed this up?

Thank you,


Product Version: UE 4.7
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asked Jun 08 '15 at 05:44 PM in Blueprint Scripting

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1.7k 105 116 229

avatar image spyro Jun 09 '15 at 09:15 AM

Another update: I created a new text render material and set it to 'unlit'. Now my whole scene drawcalls went down from 5-6 ms to 3-4 ms while rotating, but still slow.

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