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Hi, I have a question about displacement.

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Hi, I have a question about displacement.

Unread postby q1331504 » Mon Aug 27, 2018 4:45 pm

This is Google translate,,I hope you can understand my meaning. :P

Hi, I have a question about substitutions.
I added a mask over the displacement, and there was a problem.
Why is there a model tear?Is my subdivision not enough? Thank you !!! 8-)
image.JPG
q1331504
 
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Re: Hi, I have a question about displacement.

Unread postby dboude » Mon Aug 27, 2018 4:56 pm

Hi,

First, you have to enable the subdivision surface for your object.

The projection looks strange too. Could you provide us the map and the model on which you make the displacement?

Thanks, Cheers !
Démian
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Re: Hi, I have a question about displacement.

Unread postby mdkai » Tue Aug 28, 2018 8:45 am

Hi
What is the reason of using triplanar in the displacement itself ?
Even without uvs you can simply use a planar z-projection type which would match perfectly.

Triplanar is effectively used if you have very steep areas to prevent the texture from stretching when tiled.
Alternatively use a gradient with slope which gives great control over dynamic masking...
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Re: Hi, I have a question about displacement.

Unread postby q1331504 » Tue Aug 28, 2018 1:55 pm

mdkai wrote:Hi
What is the reason of using triplanar in the displacement itself ?
Even without uvs you can simply use a planar z-projection type which would match perfectly.

Triplanar is effectively used if you have very steep areas to prevent the texture from stretching when tiled.
Alternatively use a gradient with slope which gives great control over dynamic masking...


Thank you for your advice.
I want to distinguish the permutation of each part.Maybe this idea is going to zbrush.
One of my ideas is to use triplanar as mask to achieve different displacement effects in different regions.

I'll share my project files later, but I don't know why my model displacement would result in a model tear.
Thank you very much for taking the time to answer my question :D 非常感谢你抽时间回答我的问题 :D
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Re: Hi, I have a question about displacement.

Unread postby q1331504 » Tue Aug 28, 2018 2:12 pm

dboude wrote:Hi,

First, you have to enable the subdivision surface for your object.

The projection looks strange too. Could you provide us the map and the model on which you make the displacement?

Thanks, Cheers !



Thank you for answering my question.
This is the link to the package project file https://drive.google.com/open?id=1TF_oX ... NwdzHeNXjV
I want to know why that happens after the substitution, or what did I do wrong
q1331504
 
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Re: Hi, I have a question about displacement.

Unread postby dboude » Tue Aug 28, 2018 4:25 pm

So,

Your scene has several problems :

- Your displacement map is not at a good ratio. It's like a 5m wide rock disp map. It can't give a good result on an 800m large mountain when used alone.
- The value of the displacement was too high. Polygons were pushed toward themselves.
- You have to subdivide your model at least at level one to get the stitching working. But subdivide a model with 4.19 million polys is critical. You don't need displacement for such heavy geometry.

Solution ---> Use a bump or normal map instead of a displacement. Like in this example.
Mountain_scene_v006.project
(66.68 KiB) Downloaded 29 times


But if you have time and a lot of RAM and you want your displacement to work you just have to subdivide to level 1 and lower the displacement value.

Cheers !
Démian
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Re: Hi, I have a question about displacement.

Unread postby q1331504 » Tue Aug 28, 2018 4:47 pm

dboude wrote:So,

Your scene has several problems :

- Your displacement map is not at a good ratio. It's like a 5m wide rock disp map. It can't give a good result on an 800m large mountain when used alone.
- The value of the displacement was too high. Polygons were pushed toward themselves.
- You have to subdivide your model at least at level one to get the stitching working. But subdivide a model with 4.19 million polys is critical. You don't need displacement for such heavy geometry.

Solution ---> Use a bump or normal map instead of a displacement. Like in this example.
Mountain_scene_v006.project


But if you have time and a lot of RAM and you want your displacement to work you just have to subdivide to level 1 and lower the displacement value.

Cheers !


Thank you for your reply. I will try to use the scheme you provided. :D :D :D
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