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雪紅杉林

Week4

Opacity Map

Feb 1

HAVE COMPLETED:

TO-DO LIST:

  • Tested USD variants on a single plant asset

  • Authored and layered the variants in Solaris

  • Imported the USD into Unreal and verified the workflow

  • Figured out USD variants with multiple materials

  • Set up the USD layout in Houdini, integrated the variants, and used them in Unreal

  • Try Opacity Mask

In order to get cheaper leaves, I used Yichen's fern and try to assign the opacity map on it. We can use Quickuvshade visulize the texture in Sop Level.

Problem-solving

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Problem: I started with a grid and used it to replace the original leaves, but I ran into the issue shown in the image. I suspect the repeated pattern is caused by the grid’s UV projection.

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Solution: So I used UV Flatten instead of UV Project, and the result looks good now.

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I also added a keyframe animation to make it look like it’s swaying in the wind.

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Render

After that, I brought it into Unreal and used Component Builder, but it was not successful. I also imported it back into Houdini as a reference, but that was not very successful either.

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No matter whether the geometry is static or animated, it still has the same problem.

I also tried a single leaf without animation, and the result is still not good, even though it looks normal in Houdini.

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Even when I build the grid directly inside the component, it still has a problem when I import it into Unreal.

Next Week:

  1. Use VAT and integrate with Opacity Map

  2. Work on USD Variants and also integrate with Opacity Map

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