Weathering texture tool

[konstantin magnus]

Currently working on a from-scratch texturing procedure that simulates water running down surfaces.

^{Models shamelessly taken from @animatrix course files.}
Starting with projected points, the curves run along a volume until they drop onto the next underlying surfaces using nested while loops.
The watery effect is achieved in COPs where the texture is drawn based on measuring distance from texture positions to these curves.

Alright, enough art, here comes the proof of dripping  :

Edited September 18, 2020 by konstantin magnus

[animatrix]

Super cool Konstantin! I love seeing this kind of very unique and original ideas. Would be a great tutorial

I can imagine a dozen uses just off top of my head!

[konstantin magnus]

A minimalist generator for creating occlusion textures right in COPs.

// INPUT
vector pos_tex = set(X, Y, 0.0);
vector pos_mesh = uvsample(geo_mesh, 'P', 'uv', pos_tex);
vector nml_mesh = uvsample(geo_mesh, 'N', 'uv', pos_tex);

float a = radians(angle);

// OCCLUSION
float occ_sum = 0.0;
for(int i = 0; i < samples; i++){
    vector2 u = rand(pos_tex * i);
    vector dir = sample_direction_cone(nml_mesh, a, u);
    vector pos_ray = pos_mesh + nml_mesh * 1e-3;
    vector dir_ray = dir * range;
    vector pos_hit;
    vector uvw_hit;
    int prim_hit = intersect(geo_mesh, pos_ray, dir_ray, pos_hit, uvw_hit);
    occ_sum += prim_hit == -1;   
}
float occ = occ_sum / float(samples);

// OUTPUT
vector color = vector(occ);
assign(R, G, B, color);

 

texture_occlusion.hipnc

[konstantin magnus]

A texture generator for image based direct lighting.

This example is just using a tonemapped JPG. Though by appending ToneMap Ql the same procedure works with HDRIs, too. 

// INPUT
vector pos_tex = set(X, Y, 0.0);
vector pos_mesh = uvsample(geo_mesh, 'P', 'uv', pos_tex);
vector nml_mesh = uvsample(geo_mesh, 'N', 'uv', pos_tex);

float a = radians(angle);

// IMAGE BASED DIRECT LIGHTING

vector clr_sum = 0.0;
for(int i = 0; i < samples; i++){
    vector2 u = rand(pos_tex * i);
    vector dir = sample_direction_cone(nml_mesh, a, u);
    vector pos_ray = pos_mesh + nml_mesh * 1e-3;
    vector dir_ray = dir * range;
    vector pos_hit;
    vector uvw_hit;
    int prim_hit = intersect(geo_sky, pos_ray, dir_ray, pos_hit, uvw_hit);
    vector clr_hit = primuv(geo_sky, 'Cd', prim_hit, uvw_hit);
    clr_sum += clr_hit;   
}
vector clr = clr_sum / float(samples);

// OUTPUT
vector color = vector(clr);
assign(R, G, B, color);

 

texture_hdri.hipnc

[vinyvince]

On 18/09/2020 at 10:11 PM, konstantin magnus said:

 

️

 

On 18/09/2020 at 10:11 PM, konstantin magnus said:

Currently working on a from-scratch texturing procedure that simulates water running down surfaces.

^{Models shamelessly taken from @animatrix course files.}
Starting with projected points, the curves run along a volume until they drop onto the next underlying surfaces using nested while loops.
The watery effect is achieved in COPs where the texture is drawn based on measuring distance from texture positions to these curves.

Alright, enough art, here comes the proof of dripping  :

You are not weathering it, you are making art Konstantin!

I haven't seen much example as obviously Subtance has more than enough but a very nice example of advanced weathing in Houdini which picked my interest few months ago was from Wiek Luijken, 

I especially like the rainstreak flow and the realistic procedural rivet placement, something which will make sense to do procedurally in Houdini without too much struggle hopefully. On my list on things to do.

 

 

 

 

 

Edited September 21, 2020 by vinyvince

[vinyvince]

[konstantin magnus]

Point cloud based / smoothed occlusion texture going the 2D voxel field / SOP import route. This time featuring a butter squab ; )

 

texture_occlusion_VOL.hipnc

[Librarian]

Thank You for those beautiful Solutions and Tricks

[konstantin magnus]

Here is the VEX version of the streaking texture procedure. It's pretty flexible now: Starting curves from uncovered areas to any angle, jumping over gaps, gradually changing target direction, measuring curve length for any point and of course texture mapping.

_{Model taken from threedscans.com}

streaks_VEX_2.hipnc

Edited October 16, 2020 by konstantin magnus

[Wout]

coool

[konstantin magnus]

A caustics map generator rendered out in Karma using intersect() and refract().

caustics_map.hiplc

Edited March 3, 2021 by konstantin magnus

[Wout]

Oooh, pretty ! What's the render time on that ?

[konstantin magnus]

1 hour ago, Wout said:

Oooh, pretty ! What's the render time on that ?

Thank you. Calculating the emission map takes just a few seconds. The actual render time is not really affected.

[Wout]

Oh really, so you get these beautiful caustics for mere seconds, nice !!   I'll have to check out the scene file later

Edited March 4, 2021 by Wout

[PaulEsteves]

On 03/03/2021 at 10:03 PM, konstantin magnus said:

A caustics map generator rendered out in Karma using intersect() and refract().

caustics_map.hiplc

Really love this Konstantin! What is the cuastics/piclc file you're using in LOPS to render it? Is that a file you're saving out of Houdini or is that something else? If I open the file and hit render, i don't get the same results. Just trying to figure out why. 

[konstantin magnus]

On 17.9.2021 at 1:29 PM, PaulEsteves said:

What is the cuastics/piclc file you're using in LOPS to render it?

Hey Paul,

I had to save out the caustics texture map because Solaris did not update data live from COPs to LOPs. Set the gamma to 2.2 and save the image as a pic-file. 

After you have saved the image, just update the file path in stage/materiallibrary1/principledshader1 under "emission texture" and set the "tint intensity" to something like 4.

[vinyvince]

On 16/10/2020 at 9:13 PM, konstantin magnus said:

Here is the VEX version of the streaking texture procedure. It's pretty flexible now: Starting curves from uncovered areas to any angle, jumping over gaps, gradually changing target direction, measuring curve length for any point and of course texture mapping.

_{Model taken from threedscans.com}

streaks_VEX_2.hipnc

 Im surprised the result looks accurate while there are lot's of overlapping UV , do you know guys if there is a way with autouvlayout to pack and avoid cross UDIM vertex? 

  Im  trying to establish better link with Substance and Houdini , trying to get the best of both worlds.  Basically, if I create and get some asset a look made in substance of a given procedural shader like an edge and scratch procedural wearing material recreat live the mesh dependency map directly in Houdini, without any export, baking in substance, importing back blablabla... 

When I link that AO and curvature with an external prebake EXR map it's work (after I have to fix a naming error in the Lab tools) but not when I try to "live" connect. Like shown above

The image plane doesn't seem to be recognized and taken into consideration in the SBSAR processing... Im totally bloked. Image plane are named correctly, single channel as expected by substance..

Ideally at the end, processing every asset with PDG. I haven't a post from you @konstantin magnus about PDG, are you not using it ?

Im joining my hip and test substance file I quickly created.. Maybe it's a limitation of substance archive? It can't only take baked, but I guess if so we should be able to trick it isn'it?

Has Anyone done PDG map baking for all element of a scene and don't mind sharing it by chance ?

Im joining my hip and test substance file I quickly created.. Maybe it's a limitation of substance archive? It can't only take baked, but I guess if so we should be able to trick it isn'it?

 

Many thanks guys!!

 

testhoudini2.sbsar

testhoudini3.sbsar

Substance_automation_vince.hip

Edited October 25, 2021 by vinyvince

[konstantin magnus]

A simple setup for streaking paint on a texture:

paint_streaks.hiplc

[vinyvince]

Her's my take. I quickly added few things to your setup, geting more color to our blessed duck.    i tried to fade the leaking .I have not found yet how to only fade the streaks not the all thing in case I want this but I like it

@konstantin magnus

________________________________________________________________

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

@konstantin magnus

 

[vinyvince]

Edited October 27, 2021 by vinyvince