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3D Math Primer
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| /**************************************************************** | |
| * Find the distance between two points | |
| * given: (x1, y1), (x2, y2) | |
| * vector2 | |
| */ | |
| // d = √((x1-x2)² + (y1 - y2)²) | |
| /**************************************************************** | |
| * Find the distance between two points in 3d space | |
| * given: (x1, y1, z1), (x2, y2, z2) | |
| * vector3 | |
| */ | |
| // d = √((x1-x2)² + (y1 - y2)² + (z1 - z2)²) | |
| /**************************************************************** | |
| * Convert between degrees and radians and vice versa | |
| */ | |
| // 180° = 3.14rad = π | |
| // radians = degrees * π / 180 | |
| // radians = 90 * (π / 180) = π / 2 | |
| // degrees = radians * 180 / π | |
| // degrees = (π / 3) * (180 / π) = °60 | |
| // right angle = 90° = (π / 2) | |
| // straight angle = 180° = π | |
| // full rotation angle = 360° = 2π | |
| /**************************************************************** | |
| * Normalize 2D coordinates to coordinates in 3D space | |
| */ | |
| // (x / width) * 2 - 1 | |
| // -(y / height) * 2 + 1 | |
| // example: | |
| document.addEventListener('click', (e) => { | |
| mouse.x = (e.clientX / window.innerWidth) * 2 - 1; | |
| mouse.y = -(e.clientY / window.innerHeight) * 2 + 1; | |
| mouse.z = 1; | |
| rayCast.setFromCamera(mouse, camera); | |
| }, false); | |
| /** | |
| * Return a pseudorandom number in between range of min and max. | |
| * | |
| * @param {Number} minimum number to return | |
| * @param {Number} maximum number to return | |
| * @return {Number} pseudorandom number in range of min and max | |
| */ | |
| let randomInRange = (min, max) => | |
| (Math.random() * (max-min)) + min; |
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