control the shape by ramp

[wateryfield]

Happy new year, everyone.

Let me ask my first question this year, I'm sure i have saw the similar problem before, but i can't find it again.

So how can i control the shape of the grid become to a grid like. I want a smooth outline of my grid,not be a spindle. But it seems the ramp can't do it.

I will appreciate if someone give me help.

 

vopsop.hip

[3iart]

http://en.wikipedia.org/wiki/Squaring_the_circle

 

But it is a lot of fun trying....

 

</R>

 

 

squareHoleRoundPeg.hip

[kleer001]

wateryfield, what's this for?

 

this is the best I could do, but it's just starting with a circle. do you have to start with a grid? note there's not a 1:1 corespondance between the 50x50 grid and the points in the final geo, you have to toss away some points or the Triangulate2D SOP explodes because of points in the same place.

circleTheSquare-2.hip

[wateryfield]

 

http://en.wikipedia.org/wiki/Squaring_the_circle

 

But it is a lot of fun trying....

 

</R>

Thanks for your help, it looks a great fun.

 But actually i want use a ramp to control the grid, it does't need a perfect circle but much looks like a ellipse. 

 

 

wateryfield, what's this for?

 

this is the best I could do, but it's just starting with a circle. do you have to start with a grid? note there's not a 1:1 corespondance between the 50x50 grid and the points in the final geo, you have to toss away some points or the Triangulate2D SOP explodes because of points in the same place.

Actually i want do a deform so the grid looks like a leaf.

So you can see the ramp parameter deform much more like a spindle not a ellipse.

Is it possible to use a channel editor replace.

 

[wateryfield]

 

 

Thanks for your help, it looks a great fun.

 But actually i want use a ramp to control the grid, it does't need a perfect circle but much looks like a ellipse. 

 

 

Actually i want do a deform so the grid looks like a leaf.

So you can see the ramp parameter deform much more like a spindle not a ellipse.

Is it possible to use a channel editor replace.

 

I have do multiply ramp so make the grid looks  like circle much more.

But if someone can use channel editor to replace will be great.

[edward]

You can always create a parameter that has a channel with your shape. You can then do look ups using with the chf() function.

[wateryfield]

You can always create a parameter that has a channel with your shape. You can then do look ups using with the chf() function.

Thanks, edward.

I don't really understand how to do it.

The parameter with a channel was just a point which it value change over time. But i want all the point follow the channel spine.

Can you show me a simple HIP.

[kleer001]

Aha, I think this is what you're wanting. Real shame there's no bezier curves on the ramp parameter.

 

Check it

vopsop2.hip

Edited January 9, 2015 by kleer001

[kleer001]

Aha, I think this is what you're wanting. Real shame there's no bezier curves on the ramp parameter.

 

Check it

[wateryfield]

 

You can always create a parameter that has a channel with your shape. You can then do look ups using with the chf() function.

Thanks,  chf()function was i want.

 

 

 

 

Aha, I think this is what you're wanting. Real shame there's no bezier curves on the ramp parameter.

 

Check it

 

Thanks. Kleer001.

This is what i want, your example was simple enough and useful.

  

[wateryfield]

Aha, I think this is what you're wanting. Real shame there's no bezier curves on the ramp parameter.

 

Check it

 I have to call for help again.

Why the chf() funtion not working well on wrangle.

vopsop2_wrangle_unwork.hip

Edited January 11, 2015 by wateryfield

[wandersonp]

@P.z *= chf("curve", fit(@P.x, -0.5, 0.5, 0, 100.0*@TimeInc));

 

* Edit: the hip file in next post

Edited January 20, 2015 by wandersonp

[wandersonp]

hip file

 

@P.z *= chf("curve", fit(@P.x, -0.5, 0.5, 0, 100.0*@TimeInc));

vopsop3.hip

[konstantin magnus]

Cutting a grid with a curve ramp.

float scale = chf('scale');
float radius = chf('radius');
int freq = chi('frequency');
float rot = radians(chf('rotate'));

matrix3 m = ident();
rotate(m, rot, 2);
vector pos = v@P * m;

float dist = length(pos);
float angle = atan(pos.x, pos.z);
float angle_n = fit(angle, -M_PI, M_PI, 0.0, 1.0);
float shape = chramp('shape', angle_n * freq);

f@dist = (dist - radius) - shape * (scale - radius);

 

cutting_grid.hiplc