VrayWater with sharp peak waves?

[sharktacos]

I'm attempting to get the VrayWater to produce sharp crested waves like this:


The above is based on Tessendorf waves, so I figure it must be possible to get a similar look with VrayWater which also implements Tessendorf waves. However in my tests the VrayWater instead always gives me soft "melted" round peaks, rather than the angled sharp crests in the above image.

In the Tessendorf paper this is described as the "choppy algorithm" (see fig 17 & 18 on pages 3-11 & 3-12) Based on this I would assume that to achieve this effect in the VrayWater one would need to adjust the "choppy multiplier" in order to produce sharper crests. However, I was not able to get the strong crested look despite using very high values (I tried both positive and negative values for the "choppy multiplier").

Can someone point me in the right direction?

[vlado]

The Phoenix FD ocean texture will do a much better job of this.

Best regards,
Vlado

[sharktacos]

Here's what I found works pretty well:

First it helps to evaluate this with a Lambertian-type shader (i.e. no reflections or spec) before going for a water material so you can see the waves in the diffuse. Then I found that the two things I most needed to get sharp peaks were (1) setting the subdivisions on the geo high enough to see fine detail, and (2) raising the chop slider on the water texture above 1.

What I miss on the texture is the ability to stretch the waves perpendicular to the wind direction (like waves hitting a beach). I wonder if it might be possible to add a slider like this in the future?

[sharktacos]

Also in the manual it states that the "Patch size - specifies the real world size of one patch of the VRayWater texture."

Is this in measured centimeters or meters?

[vlado]

I think it's in scene units, whatever these happen to be.

Best regards,
Vlado