OTOY Forums

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.

why so much

I was trying by moving all slides from left to right. Not much seems to help.

If memory serves me right you must increase the specular depth in the render kernel settings.

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

Having a similar issue, not sure if the water looks good enough, used values from above.