CoronaSun + Daylight system = messed up

Corona Corona for 3ds Max Issues
1

Hello there,

I always use a daylight system to make sure I’m rendering with plausible sun angles for a given site’s location.
I noticed (mid-way through a project) that the CoronaSun now has a target. Interesting… Thankfully I tried moving the target to see what happened, and oh dear, it completely changed the angle of the sun, even though I’m using a daylight system… It should all be locked down, shouldn’t it? (unless in manual mode).

I’ve been switching over to a vraysun to see if the CoronaSun matches vraysun and nope, it doesn’t seem to care where I put the target or the Daylight compass, it’s completely different from the vraysun result.

Whats the deal here? This seems like a remarkably dangerous bug if it is indeed a bug.

Edit: well no other sun but the coronaSun produces direct light it seems in Corona, so in fact I have no way to be sure the coronaSun is in the right position…

2

What Corona version do you use?

3

2.0

Upon further investigation, it seems that if the CoronaSun’s target isn’t perfectly aligned with the Daylight’s compass then the sun angle is incorrect. Now that I know it’s fine, but this could land someone in a lot of trouble if they don’t realise it…

4

Hi. This is a known bug in v2 that is quite serious, and I sure hope they’ll fix it soon.

So far there’s 2 workarounds:

1 - create (move) the sun at 0,0,0

or

2

  • create a Corona sun, uncheck “targeted”, delete the sun
  • create a daylight system as you’re used to. The sun will now “remember” the untargeted setting

Hope it helps until this get fixed

5

I can’t remember this being reported, so i’m moving this topic to bug reporting board.

6

Sounds like it’s related to this:

https://forum.corona-renderer.com/ Changing sun in Daylight System to Corona Sun creates a targeted sun object #msg128954