Render problems

[Fabio Tessitore]

Frame 70

Frame 121

In my viewport is all ok. Also, I noticed that this kind of things do not happen when I remove the plane

Any ideas?

Thanks

[shan jay]

Ok this make me confused this shouldn’t look like this

[Fabio Tessitore]

Update: the problem is not the plane, but the smoke emitter. If I disable the render of the smoke, it works

[shan jay]

huh this must be a glitch. try this 

[Fabio Tessitore]

Update: the number of particles is too big, with less particle it works

[shan jay]

(the number of particles is too big, with less particle it works) 

Well I think this should be not a thing but it is.

How many particles does it need in order to work ?

maybe your computer rendering system is not very good

[shan jay]

ops the bullet was a mistake

[Fabio Tessitore]

My computer has an i7-8750H, 16G RAM, NVIDIA GTX 1050 4G

With 5000 particles works. With 7000 breaks. Same result with more than one emitter, the total must be not greater than 5000

[Fabio Tessitore]

Update: Disabling Motion Blur (Render Properties -> Motion Blur) I’am able to render 3 smoke emitter with 5000 particle each

[shan jay]

Can you send me the  blend file

[Fabio Tessitore]

Google Drive link

see frame 188

and thanks!

[spikeyxxx]

Hey Fabio, can you see if this works for you (it renders fine now on my pc…):

https://drive.google.com/open?id=1JrSws4NRLMj5BpcomNl3LA_3h5w3N4zO

[Fabio Tessitore]

Hi, it works. Please, tell me what have you changed

[spikeyxxx]

O.k., first of all, you didn’t do anything wrong, it’s a bug. I think it has already been reported (at least an other bug that is probably the same issue). I don’t know what is causing it, but I’m guessing that somewhere in the calculations of the Motion Blur, there is a division by the size or scale of the objects in the scene. When there are objects with size 0, that yields infinity and computers don’t like that and start misbehaving;)

You used a Colorramp in the Texture to control the Size of the Particles. The Colorramp had a black flag, and black means 0.

Being a genius, I changed the Value of the black color from 0 to 0.0001.

That is all! No more dividing by 0 and therefor no more infinity! Computer happy, we happy.

Took me quite some time to figure it out though, so maybe I’m not that much of a genius after all…:(

[Fabio Tessitore]

OK, thank you very much. I’ll never use zeros 🙂

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