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Particle edit does not render children (Cycles) even though Display/Children is being checked
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Description

System Information
Operating system: Windows 10 64 bits
Graphics card: nvidia gtx

Blender Version
Broken: 2.80 036ec5cae4f7 2019.02.11

Particle edit does not render children (Cycles) even though Display/Children is being checked.
This used to work in 2.79. See attached screen and blend file (HairCard2 object has particle edits).

On a side note, I noticed that in particle edit mode, C circle select mode, middle mouse button was used to deselect (left mouse to select). This seems counter-intuitive, knowing Alt seems to be the modifier to deselect in 2.8 (i.e. Alt+A to deselect all). I think deselection behavior should be unified throughout the app.


Event Timeline

Olivier Lau (yoli) renamed this task from Particle edit do not render children (Cycles) even though Display/Children is being checked to Particle edit does not render children (Cycles) even though Display/Children is being checked.Feb 12 2019, 6:24 PM
Olivier Lau (yoli) updated the task description. (Show Details)
Sebastian Parborg (zeddb) triaged this task as Needs Information from User priority.Feb 12 2019, 8:18 PM

I can't seem to get the child hairs to display in 2.79, latest build from here: https://builder.blender.org/download/

Am I missing something or is this the case with the latest 2.79 build for you as well?

I was following a video tutorial using 2.79 and child hair is displaying in the video, this is why I said this used to work in previous version. I can send you a screen (need email) but not publicly as the video is not public. I didn't try myself in 2.79 though, I was assuming it was working since I saw that in the video.

Can you try to reproduce this in both 2.79b and the latest 2.79 build then and get back to me?

Ok so I made a few more testing, let me clarify because the initial statement was not totally right. I managed to have children visible in 2.79b in particle edit mode but we need to opt out of Clycles in viewport (SHIFT+Z). However, in 2.8, SHIFT+Z is just changing the shading type and I didn't find a way to see children being displayed in particle edit more regardless of the shading type chosen. Please check this with the file I attached, if you find a way to display children in particle edit mode please let me know how.

Can you simply give me a 2.79 file where you can see the children in particle edit mode?

Here it is :

I tried a new project from scratch in 2.8 and can see children in particle edit mode, but still not with the 2.8 file I attached originally. So there must be something I did that broke it, I'll try to repeat the steps and see. I'll update if I can find anything.

Sebastian Parborg (zeddb) raised the priority of this task from Needs Information from User to Confirmed, Medium.EditedFeb 13 2019, 3:34 PM

The reason seems to be that the children become invisible with Path steps set to 8 or more.

If you set them to less than 8, they do display but they do not seem to be subdivided as they should with the steps parameter:

2.79:


2.8:

blend file:

@Clément Foucault (fclem) feel free to reassign if this is not for you. I'm guessing this is render related (?)

Thanks @Sebastian Parborg (zeddb), I confirm that moving Path Step to a value lower than 8 in particle edit properties/Display section enables to see children whereas a value of 8 or above hides them.