Increasing Resolution on Ocean Simulator

[gummipolarbear]

I am doing a ship in water simulation and wanted to know what's the best settings for foam, splashes and mist for high resolution renders? I am currently using points and it looks fine at say 3000x1506 but when increasing to 9000x4518 the foam and splashes disappear.

Which values should I be increasing to make the points bigger the point radius or the size multiplier or is there something I need to increase in the simulation?

[georgi.zhekov]

Hello,

When rendering in Point mode, changing the Image Output resolution from the Render Settings will affect the appearance of the particles rendered as points. This is due to the fact that points are treated as pixel-sized. If you double the resolution, make sure to double the Point Alpha and Point Radius settings as well.

This should be enough. No need to change any sim settings.

[gummipolarbear]

Hello,

When rendering in Point mode, changing the Image Output resolution from the Render Settings will affect the appearance of the particles rendered as points. This is due to the fact that points are treated as pixel-sized. If you double the resolution, make sure to double the Point Alpha and Point Radius settings as well.

This should be enough. No need to change any sim settings.

Thanks!! I'll keep playing with the Point Alpha and Point Radius. What does each of these do exactly? Radius is a multiplier to the pixel size and alpha does what?

Here's a sample render of my scene. Also wondering of any tips to get the foam to start at the front of the ship where it cuts the water? Should I add geometry or Source Emitter to emit Foam where it cuts the water?

[georgi.zhekov]

You can find what each parameter of the Particle Shader does here - https://docs.chaos.com/display/PHX4M...er-PointPoints

In order to make the foam appear in the front parts of the ship you can either increase the grid resolution (this will make the sim slower to calculate but more detailed) or lower the foam birth threshold.

You can find more about the foam settings here - https://docs.chaos.com/display/PHX4MAX/Liquid+Foam

If your birth threshold it too low though - foam will start appear all over the place so you need a balance between high enough grid resolution and low enough foam birth threshold - but this depends on lots of factors such as hull shape, ship speed and so on - so there are no magic values - you will need to dial them down by experimenting what works best for your setup.

Cheers!

[gummipolarbear]

You can find what each parameter of the Particle Shader does here - https://docs.chaos.com/display/PHX4M...er-PointPoints

In order to make the foam appear in the front parts of the ship you can either increase the grid resolution (this will make the sim slower to calculate but more detailed) or lower the foam birth threshold.

You can find more about the foam settings here - https://docs.chaos.com/display/PHX4MAX/Liquid+Foam

If your birth threshold it too low though - foam will start appear all over the place so you need a balance between high enough grid resolution and low enough foam birth threshold - but this depends on lots of factors such as hull shape, ship speed and so on - so there are no magic values - you will need to dial them down by experimenting what works best for your setup.

Cheers!

When would we use the Size Multiplier in the Particle Shader? Does this have the same effect to make the particles bigger as the Point Radius?

[georgi.zhekov]

The size multiplier is for when using the Bubbles/Splashes/Cellular modes - for Points you need to use the Point Radius.

[gummipolarbear]

You can find what each parameter of the Particle Shader does here - https://docs.chaos.com/display/PHX4M...er-PointPoints

In order to make the foam appear in the front parts of the ship you can either increase the grid resolution (this will make the sim slower to calculate but more detailed) or lower the foam birth threshold.

You can find more about the foam settings here - https://docs.chaos.com/display/PHX4MAX/Liquid+Foam

If your birth threshold it too low though - foam will start appear all over the place so you need a balance between high enough grid resolution and low enough foam birth threshold - but this depends on lots of factors such as hull shape, ship speed and so on - so there are no magic values - you will need to dial them down by experimenting what works best for your setup.

Cheers!

So I tried increasing resolution and lower foam birth threshold. It added more foam to the sides but not to the front of the ship. I set the foam value from 0 to 20 and that seems to work. Is this the proper way to make it work as in almost all the tutorials for ship in water they set the foam value to 0 and rely on splashes to generate foam.

[georgi.zhekov]

The way you did it sounds good. There is no specific right way, if the way you did it looks good to you, then it is totally viable.