Hair particles disappear from render and viewport with more than 7 steps #58934

New Issue

Veronica · 2018-12-07T14:11:47+01:00

Veronica commented

2018-12-07 14:11:47 +01:00

Operating system: Win 7 64bit/Win 10
Graphics card: GTX 970/GTX 1060

Tested on two computers.

Broken: 2.80 beta latest build

There are some issues when it comes to rendering hair particles in a final image. It works smoothly in viewport (doesn't even crash at all for me, at least with the steps I did), but when I hit render it appears like the hair may look incomplete (half of it missing from the head). Strand render and adaptive render both display the same result.

Also, hair converted from curves with the Hair Tools by bartoszstyperek doesn't show up at all; appearing completely invisible in final render.

Steps: Create particle hair (or convert scene from Cycles), style it/edit settings, apply material and check all is fine in viewport, then hit render and see what happens.

First blend I attached is an old file, with particle hair generated from scratch. Second blend has hair particles created from curves with the hair tools mentioned above. First case has the hair rendered only partially, second case has completely missing hair.

UPDATE: The problem is now fixed now thanks to Wo!262's suggestion. While initially it seemed mostly an odd occurance with the final rendering, it seems like the real issue was in the number of steps I added (9). The scenes were directly imported from Cycles and edited for Eevee, without changing any important value except the shape type (from strand to strip) and scaling. Apparently 7 steps are the best value for Eevee otherwise it won't work. Title changed to fit the discussion better.

hairtest_eevee.blend haifromcurves_eevee.blend

Operating system: Win 7 64bit/Win 10 Graphics card: GTX 970/GTX 1060 Tested on two computers. Broken: 2.80 beta latest build There are some issues when it comes to rendering hair particles in a final image. It works smoothly in viewport (doesn't even crash at all for me, at least with the steps I did), but when I hit render it appears like the hair may look incomplete (half of it missing from the head). Strand render and adaptive render both display the same result. Also, hair converted from curves with the Hair Tools by bartoszstyperek doesn't show up at all; appearing completely invisible in final render. Steps: Create particle hair (or convert scene from Cycles), style it/edit settings, apply material and check all is fine in viewport, then hit render and see what happens. First blend I attached is an old file, with particle hair generated from scratch. Second blend has hair particles created from curves with the hair tools mentioned above. First case has the hair rendered only partially, second case has completely missing hair. UPDATE: The problem is now fixed now thanks to Wo!262's suggestion. While initially it seemed mostly an odd occurance with the final rendering, it seems like the real issue was in the number of steps I added (9). The scenes were directly imported from Cycles and edited for Eevee, without changing any important value except the shape type (from strand to strip) and scaling. Apparently 7 steps are the best value for Eevee otherwise it won't work. Title changed to fit the discussion better. [hairtest_eevee.blend](https://archive.blender.org/developer/F5870161/hairtest_eevee.blend) [haifromcurves_eevee.blend](https://archive.blender.org/developer/F5870168/haifromcurves_eevee.blend)

Veronica commented

2018-12-07 14:11:47 +01:00

Added subscriber: @Nika-2

Jose Conseco commented

2018-12-08 18:46:25 +01:00

Added subscriber: @JoseConseco

Jose Conseco commented

2018-12-08 18:46:25 +01:00

I have gtx 660, windows 10 64bit, lated daily 2.8 build. And this both scenes works ok for me.

Veronica commented

2018-12-08 19:11:47 +01:00

I'm lost then. Because with both GPUs and OS on desktop and laptop (updated drivers and latest build) I get the same result: no hair in final render. I wonder if there's something in the settings that I need to tweak?

Veronica commented

2018-12-10 13:06:50 +01:00

Just typing this for a friend who tested my scenes but didn't create an account here yet: she has the same issues with a GTX 1080ti on Windows 10. Not sure why the hair renders normaly with F12 for you Jose, but clearly this is something that causes troubles on a lot of other systems.

msalv commented

2018-12-10 13:44:36 +01:00

Added subscriber: @moisessalvador

msalv commented

2018-12-10 13:44:36 +01:00

I can confirm and I have a gtx 1060 6gb as well (blender-2.80.0-git.e79bb957fc3-windows64)

However, I can also replicate it on viewport if I set the steps of the hair to be the same. Although the viewport softmax is 7, you can type 9 directly.

On the hairtest file, reducing the hair steps to 7 makes it render correctly, but also reducing the count of children, or changing the children from interpolated to simple. In the hairfromcurves file though, only reducing the steps seems to work. Which is weird because it has way less hairs overall, at first I thought it's like a memory issue, but I can't explain why in the second file reducing child count doesn't work

Anyway, since it happens also on the viewport, and it's related to hair resolution, child interpolation and/or memory I suggest changing the title. In the meantime, reduce the hair steps from 9 to 7 as a temporary workaround, 9 seems a little bit overkill

I can confirm and I have a gtx 1060 6gb as well (blender-2.80.0-git.e79bb957fc3-windows64) However, I can also replicate it on viewport if I set the steps of the hair to be the same. Although the viewport softmax is 7, you can type 9 directly. On the hairtest file, reducing the hair steps to 7 makes it render correctly, but also reducing the count of children, or changing the children from interpolated to simple. In the hairfromcurves file though, only reducing the steps seems to work. Which is weird because it has way less hairs overall, at first I thought it's like a memory issue, but I can't explain why in the second file reducing child count doesn't work Anyway, since it happens also on the viewport, and it's related to hair resolution, child interpolation and/or memory I suggest changing the title. In the meantime, reduce the hair steps from 9 to 7 as a temporary workaround, 9 seems a little bit overkill

Veronica commented

2018-12-10 14:14:50 +01:00

Thank you for testing it out Wo.
I have other files that give me the same issue, so I will definitely test it out as you suggested by reducing children/steps and write a report to let you guys know how that went.

Regarding the viewport, I actually have no problems with it. The hair renders nicely there for me... the partially or fully missing hair only happens if I render with F12. However, if you don't view it properly in the viewport either, then yes I guess the title needs to be changed accordingly.

I'll keep you posted!

Thank you for testing it out Wo. I have other files that give me the same issue, so I will definitely test it out as you suggested by reducing children/steps and write a report to let you guys know how that went. Regarding the viewport, I actually have no problems with it. The hair renders nicely there for me... the partially or fully missing hair only happens if I render with F12. However, if you don't view it properly in the viewport either, then yes I guess the title needs to be changed accordingly. I'll keep you posted!

Veronica changed title from ~~Hair particles do not render properly in final image~~ to Hair particles do not render properly

2018-12-10 14:16:56 +01:00

msalv commented

2018-12-10 14:17:48 +01:00

Even after changing the viewport steps to 9 you don't see it happening on the viewport?

Veronica commented

2018-12-10 14:25:47 +01:00

Ah I see what you mean! I didn't change the steps in the viewport yet.

Yes, you are correct! Switching from 7 to 9 completely removes the hair from viewport as well, while bringing it down to 7 from 9 also renders it in final image. Tbh I don't think 9 are required at this point.... 7 seems to be more than enough to produce a good result.

Thank you so much for pointing this out! I didn't really expect the children/steps could be an issue considering Cycles always worked wonders no matter the settings. I guess it's not surprising since 2.8 is still in beta.

Should anything else pop up regarding this matter I'll add more comments.

Ah I see what you mean! I didn't change the steps in the viewport yet. Yes, you are correct! Switching from 7 to 9 completely removes the hair from viewport as well, while bringing it down to 7 from 9 also renders it in final image. Tbh I don't think 9 are required at this point.... 7 seems to be more than enough to produce a good result. Thank you so much for pointing this out! I didn't really expect the children/steps could be an issue considering Cycles always worked wonders no matter the settings. I guess it's not surprising since 2.8 is still in beta. Should anything else pop up regarding this matter I'll add more comments.

Sebastian Parborg commented

2018-12-10 14:26:43 +01:00

Added subscriber: @ZedDB

Clément Foucault was assigned by Sebastian Parborg

2018-12-10 14:26:43 +01:00

Sebastian Parborg commented

2018-12-10 14:26:43 +01:00

I can reproduce this on Linux (using a AMD 290x).

Veronica changed title from ~~Hair particles do not render properly~~ to Hair particles disappear from render and viewport with more than 7 steps

2018-12-10 14:29:12 +01:00

Clément Foucault was unassigned by Veronica

2018-12-10 14:29:12 +01:00

Veronica commented

2018-12-10 14:29:12 +01:00

Added subscriber: @fclem

Sebastian Parborg commented

2019-01-04 16:54:30 +01:00

Changed status from 'Open' to: 'Resolved'

Sebastian Parborg closed this issue

2019-01-04 16:54:30 +01:00

Sebastian Parborg self-assigned this 2019-01-04 16:54:30 +01:00

Sebastian Parborg commented

2019-01-04 16:54:30 +01:00

I guess I'll mark this as resolved then (?)

Aranzazu Hurtado commented

2020-01-18 16:58:03 +01:00

Added subscriber: @zutxita

Aranzazu Hurtado commented

2020-01-18 16:58:03 +01:00

It also happens to me, I have an AMD and a NVIDIA GTX 1060 6Gb. I don't see hair in viewport, set to strip. With the strands I see it black, in eevee. With the principled hair BSDF

system-info.txt

It also happens to me, I have an AMD and a NVIDIA GTX 1060 6Gb. I don't see hair in viewport, set to strip. With the strands I see it black, in eevee. With the principled hair BSDF [system-info.txt](https://archive.blender.org/developer/F8285463/system-info.txt)

spacesheep001 commented

2020-06-06 01:45:13 +02:00

Added subscriber: @spacesheep011

spacesheep001 commented

2020-06-06 01:45:13 +02:00

This comment was removed by @spacesheep011

*This comment was removed by @spacesheep011*

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Hair particles disappear from render and viewport with more than 7 steps #58934