• Interactive Poisson Blending on GPU
• Simplest and Fastest GLSL Edge Detection using Fwidth

# Monthly archives: October, 2017

## [Solution] Leetcode 719. Find K-th Smallest Pair Distance

Given an integer array, return the k-th smallest distance among all the pairs. The distance of a pair (A, B) is defined as the absolute difference between A and B. Input: nums = [1,3,1] k = 1 Output: 0 Explanation: Here are all the pairs: (1,3) -> 2 (1,1) -> 0 (3,1) -> 2 Then the 1st…

## Some random summaries on deferred rendering

Here are some random thoughts and summaries on deferred rendering pipeline. Deferred shading is generally faster than forward shading According to Unity3D, As a general rule, Deferred Rendering is likely to be a better choice if our game runs on higher-end hardware and uses a lot of realtime lights, shadows and reflections. Forward Rendering is…

## Some issues in VR – A personal note

Vergence-accommodation conflict Vergence movements are closely connected to accommodation of the eye. Under normal conditions, changing the focus of the eyes to look at an object at a different distance will automatically cause vergence and accommodation, sometimes known as the accommodation-convergence reflex. Visual odometry Match moving VR in practice GPU-based rendering (almost) as usual (OpengGL,…

## My Chatbot in WeChat Platform

It is nothing related with AR and VR. But in the era of AI, who wouldn’t want to develop a cute chatbot? Feel free to scan the QR code below to follow our cute pet 🙂  Most of the code is based upon Python. I have developed the following functionalities. AIML matching Dictionary Idiom Wikipedia…

## PostProcessing: Brightness, Contrast, Hue, Saturation, and Vibrance

Real-time image manipulation is always fascinating. With the power of the modern GPU, it is possible to achieve the postprocessing effects all in a single shader. Remember that in GLSL, matrix are column major. Brightness is a float between [-1, 1], directly adding to the RGB Contrast is a float between [0, 1, ∞], directly…

## [Leetcode] 691. Stickers to Spell Word

Leetcode 691 is an interesting problem, I didn’t notice that T <= 15. BFS is good enough (and even faster) for this, but dynamic programming with bit compression is the ultimate solution with more words.