Water (need help on materials)
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Important notice: All artwork submitted on our public gallery forums gallery forums may or may not be used by OTOY for publication on our website gallery.
If you do not want us to publish your art, please mention it in your post clearly. (put a very red small diagonal cross in the left right corner of the image)
Any images already published on the gallery will be removed if the original author asks us to do so.
We recommend placing your credits on the images so you benefit from the exposure too, and use a minimum image width of 1200 pixels, and use pathtracing or PMC. Thanks for your attention, The OctaneRender Team.
For new users: this forum is moderated. Your first post will appear only after it has been reviewed by a moderator, so it will not show up immediately.
This is necessary to avoid this forum being flooded by spam.
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larmannjan
- Posts: 81
- Joined: Mon Mar 07, 2011 7:25 pm
I want to create this glass of beer. Besides the fact that the color is off there is another problem. The water is black for some reason. Can anybody help me.
Win 7 64-bit | GTX580 | i7- 2600 @ 3.4Ghz | 12GB
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Elvissuperstar007
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why so much
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larmannjan
- Posts: 81
- Joined: Mon Mar 07, 2011 7:25 pm
I was trying by moving all slides from left to right. Not much seems to help.
Win 7 64-bit | GTX580 | i7- 2600 @ 3.4Ghz | 12GB
You can read this post for an introduction on how the medium node works: http://render.otoy.com/forum/viewtopic.php?f=21&t=9380. The medium scale value is indeed too high. Check out the graph on Wikipedia: http://en.wikipedia.org/wiki/Electromag ... n_by_water. You can approximate this by setting an RGB color of (0.50, 0.05, 0.01) and a scale of 1.0. A scale value of 1.0 and a absorption texture value of 1.0 corresponds to 1 m^-1 or 100 cm^-1. For beer you would need more absorption in the green and blue bands of the spectrum.
You should also make sure you don't create meshes with overlapping planes. For the water on the table, you should only model the upper surface. Modeling water in a glass is more tricky because Octane doesn't support overlapping mediums. You should split the glass in three meshes: one with the glass material for the outside of the glass, and one with a water material for the top surface of the water and one for the surface between the glass and the water. For this surface, set the absorption to the settings used for the water or beer, make sure the normals are pointing inwards and set the index to 1.0 (this is only an approximation, the correct index would be the index of water divided by the index of glass, which is smaller than 1.0).
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Roeland
You should also make sure you don't create meshes with overlapping planes. For the water on the table, you should only model the upper surface. Modeling water in a glass is more tricky because Octane doesn't support overlapping mediums. You should split the glass in three meshes: one with the glass material for the outside of the glass, and one with a water material for the top surface of the water and one for the surface between the glass and the water. For this surface, set the absorption to the settings used for the water or beer, make sure the normals are pointing inwards and set the index to 1.0 (this is only an approximation, the correct index would be the index of water divided by the index of glass, which is smaller than 1.0).
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Roeland
Having a similar issue, not sure if the water looks good enough, used values from above.
- Daz2Octane Water test
Win 11 64GB | NVIDIA RTX3060 12GB