Before i request it as a feature whish i better ask if there is allready a solution for this i maybe don’t know.
I’m just working on a quick animation, filming the open sea from a boat. The wind speed is about 5 meters - lightly stormy.
My problem is the movement or rather the traveling of the waves. Even though the Backfilter is set to one, it seams to me that the waves do not travel really far until they disapear.
Here and there they even seam to move backwards. I’ve attached a short clip of my current wave movement. wave_movement_01.mov (3.06 MB)
It looks more like a bumping motion but at this wind speed i would expect the whole ocean surface appear to flow along the wind direction.
If there isn’t allready a solution could it by solved by simply moving the wavemaps along the wind direction over time by a specified value?
There is something you can do to hopefully get the motion you’re looking for. You could try increasing the “Directionality” parameter in the Bermuda Node.
In the Bermuda simulation, the waves are generated in all directions, and a higher “Directionality” setting smoothly filter out waves that are not traveling in the wind direction. That might explain the waves that seem to move backwards.
Note: Usually when increasing directionality, either the wind speed or height scene needs to be increased a little because a some of the waves will be flattened out (the ones non-parallel to the wind).
OK, Thanks. It seams i missunderstood the directionality parameter, i thought it simply stretches the wave perpendicular to the wind direction.
Than i will try it out.
All right, i increased the directionalitiy and it is a little better now but still not exactly what i wanted.
I found a video on YouTube that shows what i had in mind, you have to scrub to about the half of the movie.
I sort of see what you’re saying with this youtube video. It’s more of a shallow quickly moving water force? The wave equations I’ve implemented do not simulate this very well.
I tried a few fakey ways of making it look more like this source footage. The video I attached is simply a non-physical wave motion in the wind direction (The image on the LEFT is unmodified, the image on the RIGHT is with my changes). Is this closer to the look you were trying to achieve? Or would something more complex be needed?
Note that you can’t really do this in Bermuda since it applies the waves in world-space, and this is essentially an animated translation on the displacements. I just rigged something up for this test. wavemotion.mov (2.32 MB)
This looks much better and the behavior like in the left picture was exactly what i’ve mean, that the waves just seam to sway back and forth but do not have an actual flow movement.
I think it’s not that important that it is physicaly simulated as long as it looks realistic enough, maybe later you find a more physical way but for now this will definitelly work.
But i would also like to know what the others here think about it.
i see the issue - i think that the second image [on the right[ that conrad created is superior - but actually still doesnt ahve enough motion for certain sequences. perhaps we need to have an animation/direction xform slider node or value that represents ‘speed’ and direction so that you can implement this directly in the tool. conrad?
My first idea was to use max’s transform gizmo so users could animate the waves.
Being able to animate the translation would give a lot of control, but a more user-friendly simple approach would be to have a translation speed (that only worked in the wind direction). I think the second option would cover most cases, and be less confusing.
BTW, does bermuda use the Tessendorf method for wave generation? some tools i used in the past that use this method don’t seem to have this issue. But as allways, i guess it’s not that trivial.
