NakedNous

A depth-of-field blur effect where the focal plane is driven by a live world-space position. The scene is rendered into a p5.Framebuffer, then a p5.strands DOF pass is applied via pipe(). The magenta sphere is the focal target — its screen-space z is recomputed every frame with mapLocation() and fed directly into the shader, so the blur follows the sphere continuously. A first-person directional light tracks the viewer using mapDirection(). The shader as a strands callback The DOF pass is authored as a p5.strands callback on baseFilterShader().modify(). There is no raw GLSL string — the algorithm is expressed in JavaScript using the strands DSL, which compiles it to WebGL2 under the hood. ...

Multi-pass post-processing with p5.strands and pipe(). Three filter passes — depth-of-field blur, value-noise warp, and pixelation — are chained over a scene framebuffer. Each pass is a baseFilterShader().modify() callback; createPanel wires their uniforms automatically. Press 1, 2, or 3 to rotate the pass ordering at runtime. Shader passes as strands callbacks Each post-processing pass is a baseFilterShader().modify() callback — a plain JavaScript function using the p5.strands DSL. The framework compiles each callback to WebGL2 at startup; no raw GLSL strings are needed. ...

Toon shading, or cel shading, gives 3D geometry a flat, cartoon-like look by quantizing diffuse reflection into a finite number of discrete shades. In this p5.js v2 version the shader is written as a baseMaterialShader().modify() hook using the p5.strands DSL — no raw GLSL strings, no hand-written vertex shader. createPanel wires the color and shades controls to the shader automatically each frame. Toon shader The combineColors hook in baseMaterialShader().modify() receives the eye-space vNormal varying directly — no vertex shader boilerplate required. Diffuse intensity is the dot product of the surface normal and the (normalized) light direction; it is then snapped into discrete bands to produce the cel-shading look. ...

A 3D brush painting sketch that uses depth control for VR-style experiences. mapLocation() converts screen-space mouse coordinates and a depth slider value directly into world-space positions, so each brush stroke is placed precisely in 3D. Press r to toggle recording, c to clear, f to re-focus the camera on the world origin. Screen-to-world mapping with mapLocation The core of the brush is a single mapLocation call that lifts the 2D mouse position — together with a depth value from the slider — into 3D world space each frame: ...

Perspective projection is a fundamental concept in 3D graphics. The transformation maps a view frustum — a truncated pyramid — into a cube of Normalized Device Coordinates (NDC), producing the foreshortening effect that makes 3D scenes look convincing. The sketch below morphs a set of cajas (boxes) continuously from world space into NDC space, rendered from a third-person camera that also displays the frustum being transformed. Shaders The morph lives in a single GLSL hook injected into p5’s base shaders through buildColorShader and buildStrokeShader — no shader files needed. ...

p5.tree is a render pipeline layer for p5.js v2 — pose and camera interpolation, coordinate-space conversions between WORLD / EYE / SCREEN / NDC, frustum visibility, HUD, multi-pass post-processing, picking, and declarative control panels. The demo below exercises all of it at once. Under the hood it’s three independent packages: a renderer-agnostic numeric core (@nakednous/tree — math, spaces, keyframes, visibility), a lightweight DOM layer (@nakednous/ui — sliders, transport), and a p5.js v2 bridge that wires them to the canvas. The dependency direction is strict and one-way — the core knows nothing about p5 or the DOM — which is what lets the same keyframe interpolation that drives a camera path also animate any object, and lets the whole stack run headless or in a future renderer without touching the math. ...

Tree-like affine transformation hierarchies are at the core of many tasks in rendering, interaction, and computer vision—from view frustum & occlusion culling and collision detection to motion retargeting and post-WIMP interfaces. Our recent publication, nub: A Rendering and Interaction Library for Visual Computing in Processing, introduces a functional and declarative API, built around a dataflow-based architecture that integrates rendering and event-driven interaction through a simple yet powerful scene graph model. Built on top of Processing’s 2D/3D environment, nub offers a lightweight and expressive foundation for education, research, and experimentation in visual computing. It supports hierarchical rendering, multi-view scenes, view-based interaction, and extensible workflows for interactive content. ...

This demo illustrates new capabilities of the WebGL mode in the next major upcoming version of p5.quadrille.js, currently under development. It showcases how Platonic solids can be stored in quadrille cells and rendered using either immediate or retained mode with the p5.platonic library. Platonic Cells Platonic cells are cell functions (cellFn) that implement the filling of Platonic solid cells in a quadrille game. Retained Mode (mouse click to clear/add Platonic solids, drag to navigate; press s (or c) to save) ...

Platonic solids, named after the philosopher Plato, are highly symmetrical, three-dimensional shapes. Each face of a Platonic solid is the same regular polygon, and the same number of polygons meet at each vertex. This sketch demonstrates the rendering of Platonic solids using the p5.platonic library, showcasing both the immediate mode and retained mode rendering of the shapes. Check out the platonic cells example, which fills quadrille cells with the Platonic solids introduced here. ...

In the field of image processing, the application of convolution matrices to images stands as a cornerstone technique. This post focuses on illustrating this process through an interactive visualization, utilizing the Quadrille filter method alongside custom display functions. The visualization aims to clarify how various masks affect individual pixels in a source image, making the intricate process of image convolution more comprehensible. By offering an interactive experience, it sheds light on the significant impact these matrices have on digital images, providing a deeper insight into a key image manipulation method. ...