Boat simulation again

[JuhaHo]

I'm Starting to get some results, however I have long way to go to get sea look like this, I took when boating around my home island.
https://maps.app.goo.gl/TBnBm89Rv7f5aQ74A

https://maps.app.goo.gl/TBnBm89Rv7f5aQ74A

I got this by using the default Chaos Phoenix seawater material. Also, the foam is overexposed. However the simulation shape is starting to look OK. How should I modify the material and light settings?

[JuhaHo]

I have used the default water material here. I don't understand where the turquoise color comes from.

[JuhaHo]

I wonder what do I need to change to change this:



to more like this:

[JuhaHo]

Water is beginning to look - not good, but acceptable. I still don't like the foam. Any ideas for that?

[georgi.zhekov]

The water color can be controlled via the Fog color in the V-Ray material options - the darker the color - the darker the water will be.

The foam color is controlled by the Phoenix Particle Shader - if you wish to have a darker color for it you can dial down the brightness a bit.
By default it will use the Points mode - which renders faster but tends to look a bit flatter. You can experiment with the Bubbles mode for example, it will look better, but will render slower.

You can find more about the Particle Shader settings here - https://docs.chaos.com/display/PHX4MAX/Particle+Shader

[JuhaHo]

Thanks,

I'm really confused with the materials in V-Ray. When I drag V-Ray Water material from built in V-Ray material library to Material editor, the look changes dramatically. The right water material looks black in the material editor left. The bottom material is the default V-Ray Speed boat simulator material, but it looks even more awful in renderings than the "black water". There's nothing I can do in Material editor to make water material other than black. What value I should change to make it better?

[georgi.zhekov]

The material editor will just give you an idea of how the material will look like - but it's not aware of what you have in the scene - it's just for preview.

When you have reflective and refractive materials such as water for example - their final look depends on the surrounding objects in the scene - if you have sea bottom for example or sky - both of these will reflect and refract in the final render, but won't show up in the material editor.

The main settings that contribute to the final water color (if you're using the water shaders or one of our presets) - the IOR, the fog color and the fog depth. You can find more about these options and how they affect the rendering here - https://docs.chaos.com/display/VMAX/...Mtl-Refraction

My suggestion is to rely more on what you see in the render via V-Ray IPR and dial the look directly in the V-Ray frame buffer rather than relying only on the Material Editor.

[JuhaHo]

Thanks,

I changed the foam shader to bubble mode. I somehow looks more nice, but yet there's gigantic bubbles on the foam. Where should I change this? Also the rendering time increased by 20X. I can't share the images, because there's boat included.

[georgi.zhekov]

The bubble size can be changed through the Particle Shader - this will change them only during render time and you don't have to run the simulation again.
Alternatively you can change their size in the Foam options in the Phoenix Simulator - this will make them behave differently during the simulation itself. You can see how size affects the simulation here - https://docs.chaos.com/display/PHX4M...iquidFoam-Size

As for the rendering speed when using bubbles, there are a few things you can try:

1 - Increase the Volume Light Cache Speedup option in the Phoenix Particle Shader for the Foam - this will make the particles render faster but it might show some artifacts if you go too high. By default the value is set to 0.9 but you can set it to 0.999 and it will render faster.
If there are artifacts you can lower tha value down to 0.5 or even lower.

2 - In the Atmospheric settings (https://docs.chaos.com/display/PHX4M...phere+Settings) you can enable the Probabilistic shading and adjust the Samples - lowering the samples should speed up the rendering but might introduce some noise. There is no correct value for the samples, but you can play around with 3, 5, 10 and see what works best for you.