How to stop solartime change from animating?

Cesium for Unreal
1

Hi everyone,

is there a way to instantly change the solar time of cesium sun sky in blueprint? Currently the workflow is

  1. Set Solar Time
  2. Update Sun
  3. Wait for 5 seconds for the animation to finish

because step 1 and 2 start an animation, that is a couple of seconds long. I know, that manually setting the solar time does not start an animation, but i need to do this a couple of times automatically during runtime.

Thank you

2

Hello, do you know why does the Solar Time is between 4.0 and 22.0? And what’s the meaning of them?

3

To my knowledge, the Solar Time is a representation based on old sun clocks. Every hour represents 15° of change in rotation of sun light. And the range of 4 to 22 is probably an appoximation of the timeframe, where daylight is available.

4

Thanks for your explaination!

5

Can you elaborate? I don’t know why those steps would start an animation at all.

6

I am working without auto exposure, so it actually can get dark in the evening. When I change the solar time from day to evening, I get this:

img1
img11920×1080 104 KB

and after about 5 seconds of slow transitions i get the final result:

img2
img21920×1080 32.2 KB

Edit: When i turn off autoexposure in the same moment as i change the solar time the “animation” starts with this (I only include this because the weird borders are easier to see, that are also present on the first image):

image1
image11920×1080 65 KB

7

I’m not really sure what’s going on there. Do you have the same problem with Unreal’s built-in SunSky as well? Our CesiumSunSky is closely modeled on that one.

8

Yes, it has the exact same behaviour.

9

Ok, in that case you might have been luck asking the question in Epic’s Unreal Engine forums, since it sounds like it has little to do with Cesium for Unreal.