Why is my grass shading so weird?

KrunkFu · March 26, 2015, 2:53am

This is my material setup. I wanted to make simple shadeless(single color) grass that accepts shadows. Something like this I guess https://farm6.staticflickr.com/5569/14949490846_72bd065249_b.jpg

This is how the grass looks from one angle which is somewhat close to what I’m aiming for.

This is what it looks like from another angle. This is not what I want.

Here are the normals(the ones in green) of the grass patch

I was always told that on grass the normals should face up but when I did that this is what I got from every angle

Can someone explain to me what it is that I’m doing wrong? All I want is just simple looking grass.

Any answers/advice would be greatly appreciated as I am at my wits’ end with this grass.

vgripps123 · August 5, 2015, 1:58am

maybe check double sided geometry

vgripps123 · August 5, 2015, 1:59am

maybe try double sided geometry

anonymous_user_cc69b907 · August 5, 2015, 6:39pm

Hello KrunkFu,

The last picture that you linked requires that yo rebuild lighting.

I would start with this.

I see that you have two sided turned on in the details panel of your material. As well as two sided foliage so those are covered as far as troubleshooting goes.

If you are using world position offset, as I see you are to achieve the motion of the grass, then switch your lights to stationary or movable. This will allow for the dynamic lighting look you are trying to achieve.

If you painted this with foliage then under your foliage panel where you have your mesh added to that brush there are options for density and other parameters.

Scroll down to Instance settings and make sure that you have cast shadow enabled.

If you are still experiencing this issue after these troubleshoots then please post again.

Thanks,

anonymous_user_cc69b907 · August 7, 2015, 1:57pm

Hey KrunkFu,

I haven’t heard from you yet. I was wondering if you were still experiencing this issue or if you had resolved it yourself?

Thanks,

anonymous_user_cc69b907 · August 10, 2015, 1:18pm

Hey KrunkFu,

Due to tracking issues. I will be marking the last answer I gave as correct.

If you are still experiencing this issue then please comment again and I will continue to work with you on this issue.

Thanks,

KrunkFu · August 11, 2015, 1:02pm

I missed your reply. Sorry about that. Its been a while since I asked this that even I forgot about it.

I am still having this issue.
I went back and checked my settings and I have:
2 sided geo on
Light is set to movable because of my day and night cycle
I have force no precomupted lighting on and I’m using a light propagation volume so no need to rebuild lighting.

I’m not sure why it says I do in the screen shot but it looks the same either way.

I started a thread here as well: Grass Shading Issue - Rendering - Unreal Engine Forums

I think the issue is with my mesh and its normals. I’ve given up on grass for a while and focused on other things. When I revisit grass and figure all of this out I’ll make sure to come back and post it here.