Like Sketch ?

[Librarian]

Block ? just wonder ? Best Approche ?

 

shader.hiplc

Edited March 13, 2021 by Librarian

[konstantin magnus]

The measure SOP has a principal curvature direction you could use for hatching.

 

sketch.hipnc

Edited March 14, 2021 by konstantin magnus

[Librarian]

perfect solution Thank you @konstantin magnus

Edited March 14, 2021 by Librarian

[konstantin magnus]

Thanks, but I am not so sure whether this comes close to the example image you have provided.

 -> 

Most of us just trail scattered points. So would anyone know how to achieve evenly spaced strokes?

https://mrl.cs.nyu.edu/publications/illustrating-smooth/hertzmann-zorin.pdf

 

[Librarian]

if this with this,


And I'm happy with This

Edited March 15, 2021 by Librarian

[konstantin magnus]

On 14.3.2021 at 2:46 PM, Librarian said:

 

Good art work! You can also make curves follow the mesh topology by choosing directions towards neighbour polygons.

 

topo_flow.hipnc

topo_flow_only_curvature.hipnc

Edited March 15, 2021 by konstantin magnus

[Librarian]

Thank You Magnus

[konstantin magnus]

Hand painted looking textures for low-poly models:

 

 

paint_bake.hipnc

Edited April 11, 2021 by konstantin magnus

[vinyvince]

On 14/03/2021 at 12:17 AM, konstantin magnus said:

The measure SOP has a principal curvature direction you could use for hatching.

 

sketch.hipnc

This is nice, thanks Konstantin.

I quickly did a test to combining with gradient,  interesting...

I guess i have to make a custom "triplanar"network to blend each gradient result for each component of my input vector to measure.

________________________________________________________________

Vincent Thomas   (VFX and Art since 1998)
Senior Env and Lighting  artist & Houdini generalist & Creative Concepts
 http://fr.linkedin.com/in/vincentthomas

 

[supermac]

wow.. you are really incredible..

Please, what is this language in Attribute wrangle?

"string direction = chs('direction');
vector pos = v@P;
vector dir = point(0, direction, i@ptnum);

int pts[] = array(i@ptnum);
int steps = 30;
float angle = 1.0;
while(steps > 0 && angle > -0.1){
    steps--;
    pos += normalize(dir) * 0.002;
    int prim;
    vector uvw;
    xyzdist(1, pos, prim, uvw);
    vector dir_old = dir;
    dir = primuv(1, direction, prim, uvw);
    angle = dot(dir_old, dir);
    if(angle < 0.0){
        dir *= -1.0;
    }
    int pt_add = addpoint(0, pos);
    append(pts, pt_add);
}
addprim(0, 'polyline', pts);"

 

thank you very much.

 

bests regards

[konstantin magnus]

32 minutes ago, supermac said:

Please, what is this language in Attribute wrangle?

It's Houdini's own shader language called VEX. Matt Estella provides an artist friendly introduction:
https://www.tokeru.com/cgwiki/index.php?title=JoyOfVex

The same programming can also be done visually using VOP nodes which is probably easier for starters.

[supermac]

thank you very much..

i see that.

 

now, i will learn all of that.

 

I wish you a good day