I need some advice on the ripples of the ship.

[eunchae]

Hello.

I want to make a ripple like image.

If you do not use the ripple solver (without simulation) is there any way i can make it?

If you have any good ideas, please share them with me.

I wish I could customize the length, width...etc of the ripple. thank you.

[konstantin magnus]

Hi @eunchae,

you could copy and transfer displaced grid rows into a height field:

boat_waves.hiplc

[konstantin magnus]

Alternatively remap and average out directions and distances to points across a height field:

float scale = chf('scale');
float range = chf('range');

float disps[] = {};
int pts[] = nearpoints(1, v@P, range * 4.0);
foreach(int pt_near; pts){
    vector pos = point(1, 'P', pt_near);
    vector nml = point(1, 'N', pt_near);
    float pscale = point(1, 'pscale', pt_near);
    vector dir = normalize(pos - v@P);
    float angle = fit11(dot(nml, dir), 0.0, 1.0);
    float dist = distance(pos, v@P);
    float shape = chramp('shape', angle);
    float dist_mod = dist * shape * pscale;
    float mask = 1.0 - smooth(0.0, range, dist);
    float wave = sin(dist_mod * 0.02);
    float height = 1.0 - chramp('height', angle);
    float disp = height * mask * scale * wave;
    append(disps, disp);
}

f@height = avg(disps);

 

boat_waves_VEX.hiplc

[eunchae]

On 2021. 9. 27. at 6:05 PM, konstantin magnus said:

Alternatively remap and average out directions and distances to points across a height field:

float scale = chf('scale');
float range = chf('range');

float disps[] = {};
int pts[] = nearpoints(1, v@P, range * 4.0);
foreach(int pt_near; pts){
    vector pos = point(1, 'P', pt_near);
    vector nml = point(1, 'N', pt_near);
    float pscale = point(1, 'pscale', pt_near);
    vector dir = normalize(pos - v@P);
    float angle = fit11(dot(nml, dir), 0.0, 1.0);
    float dist = distance(pos, v@P);
    float shape = chramp('shape', angle);
    float dist_mod = dist * shape * pscale;
    float mask = 1.0 - smooth(0.0, range, dist);
    float wave = sin(dist_mod * 0.02);
    float height = 1.0 - chramp('height', angle);
    float disp = height * mask * scale * wave;
    append(disps, disp);
}

f@height = avg(disps);

 

boat_waves_VEX.hiplc

Thank you. If I have to ask you one more thing, can you make it like the last pattern in the video? Even if I use ripple sop, such a shape does not come out.

 

[konstantin magnus]

Hi @eunchae,

@ssh has already implemented the Kelvin Wake pattern in Houdini:

 

[eunchae]

9 hours ago, konstantin magnus said:

Hi @eunchae,

@ssh has already implemented the Kelvin Wake pattern in Houdini:

 

Thank you!

[konstantin magnus]

There is a Kelvin Wakes deformer in SideFX Lab's now:

https://www.sidefx.com/docs/houdini/nodes/sop/labs--kelvin_wakes_deformer-1.0.html