animatrix

VEX Poly Carve SOP on Closed Surfaces

Poly Carve SOP can also carve closed polygons where it will still use the points but instead of creating multiple curves, it will keep a single polygon.

This method will carve geometry like a...

Upcoming Video Tutorials

Based on regular feedback regarding the technical level required to fully understand my content, I have decided to create regular video tutorials on Patreon, ideally around 30 minute mark per video...

VEX Poly Carve SOP

Carves out polygons using a point attribute with the ability to define the carve values per primitive using primitive attributes.

Pure VEX implementation, 10x faster than the default Carve SO...

TimeBlend SOP

This operator will cook its input at the nearest available (sub)frames. The values are then blended according to the fractional position within the nearest available (sub)frames.

After using ...

Substeps and Subframe Interpolation

In Houdini, dealing with substeps is a complex phenomenon. Writing them is easy, but reading and interpolating between the subframes is tricky.

To write subframes on disk, all you have to do ...

VEX From Polar COP

Transforms a polar image into a rectangle.

Reverse operation of To Polar COP.  This operation will preserve the aspect ratio of the image provided the input image has the appropriate siz...

VEX To Polar COP

Transforms a rectangle image to polar coordinates.

This operator demonstrates a lot of useful techniques that can be applied in any contexts as a generic operator. In the future, there will b...

VEX Ocean Spectrum Retime SOP

Retimes ocean spectra by altering the time scale directly on the spectra volumes, rather than at the evaluation step, and computes the new time offset to keep the same ocean look by using the refer...

Blend VOP

Computes a blend between 2 values.

The list of supported attribute types are float, vector, vector2, vector4, matrix3, matrix and float array.

In the case of vectors (vector2/3/4), it h...

Blend Color VOP

Linearly interpolates between two colors.

By default it blends colors using the LCh color space. LCh is the perceptually uniform equivalent of HSV, and defines colors using intuitive and perc...

VEX Coil SOP

Creates curves that coils around other curves.

https://www.dropbox.com/s/8zd2org3ygni...

VEX Limit Surface Sample SOP

Evaluates attributes at the subdivision limit surface using Open Subdiv.

It can be used to preserve the curvature of a geometry after adding new geometric detail, or to create an isoline disp...

VEX Path Deform SOP and VEX Volume Sharpen SOP Updates

Volume Sharpen SOP can now sharpen VDB volumes on the non-OpenCL branch.  

I implemented a lot of new enhancements for the Path Deform SOP. It's a much more powerful deformer now th...

VEX Path Undeform, Bias and Gain

Path Deform can supersede a lot of deformers like bend, bias, gain, stretch and twist with the ability to describe much more complex deformations along a path.

That's why I decided to enhance...

Compilable SOPs

Here is the list of compilable SOPs as of right now:

Bend SOP

Bias SOP

Boxify SOP

ClusterFoam SOP

ColorRandom SOP

ConvertPackedToPoints SOP

CurveFrame SOP<...

Lambda SOP

This operator invokes any number of operations on any number of  arbitrary attributes over any geometry/element/number or no input at  all, in a feedback or merge gather style.

Update

Hi everyone, the year is almost over. Just want to inform everyone that I have been updating a lot of HDAs in the background, for bug fixes, new features, improved performance and making sure the H...

OpenCL Smooth SOP

Smooths out points using a low pass filter either by Taubin or Laplacian algorithm.

1. OpenCL acceleration.

2. VEX code branch.

3. Two algorithms to choose from: Taubin and Laplacian. I ...

Viscoelasticity: Multi-Threaded Gas Strain Forces DOP Using VEX

The built-in Gas Strain Forces DOP is single-threaded. This is the VEX version of the Gas Strain Forces DOP, that uses a strain field to determine what forces should be applied to mitigate that strain...

Convert Packed To Points SOP & Transform Packed SOP

Convert Packed To Points SOP allows you to convert packed geometry into points and stores the packed transform and pivot data on the points. It has an option to convert the transform primitive intrins...

VEX Point Connect SOP

Creates poly lines between points.

Has a lot of parameters that streamlines constraint network creation, such as inter/intra-clusters.

Can optionally connect between the same/differing attribu...

OpenCL Volume Blur SOP

Applies Gaussian blur to a volume.

Features:

1. It is orders of magnitude faster than the default Volume Blur SOP when significant number of iterations are used and OpenCL acceleration ...

Color Nodes in a Subnet by Creator

A quite useful and a hidden gem inside Houdini is its feature to record the name (and computer) of the creator of every single node ever created. It's not displayed anywhere by default so I wrote a Py...

OpenCL Volume Sharpen SOP

Sharpens the voxels of a volume using the unsharp mask technique that enhances edges via a procedure that subtracts a blurred version of the volume from the original volume.

Features:

1. It is...

OpenCL Volume Convolve SOP

Convolves a volume by a 3×3×3 kernel using OpenCL acceleration.

This operator takes each 3×3×3 neighbourhood of a voxel, multiplies it by a set of coefficients, and combines the result into a to...

[VEX] Camera Based Point Cloud Occlusion With Variable Radius [Scene]

How to delete points from a camera view using occlusion in a point cloud with variable radius, without instancing actual geometry.

Because of the perspective distortion, it might look like there are...

OpenCL Relax SOP

Moves points away from each other using their edge or primitive neighbours.

1. OpenCL acceleration.

2. VEX code branch.

3. Ability to use edge or primitive neighbours.

4. Ab...

Adaptive Subdivide SOP

Adaptively subdivides geometry using proximity look ups to another geometry.

Subdivision depth: 14

6.5M vs 26.8B polygons (about 4K less)

To avoid having holes in the geometry, use the H...

VEX Adjacency Graph SOP

Creates connections between adjacent pieces of a geometry where each piece has a unique attribute.

This is a much more generalized version of what's shown in the video.

It has a lot more featu...

VEX Cluster Foam SOP

Creates foam clusters from a point cloud.

Can be used for a variety of effects like creating whitewater foam.

Implemented entirely using VEX. Shows a couple tricks like pre-generating points t...