coordinate - w3toppers.com

Transfer coordinates from one triangle to another triangle

Let you have unknown affine transformation matrix | a c e | M =| b d f | | 0 0 1 | The first triangle vertices are (xa1, ya1), (xa2, ya2), (xa3, ya3), and the second triangle vertices have coordinates (xb1, yb1), (xb2, yb2), (xb3, yb3). Then affine transformation M that transforms the first … Read more

How to get object in WebGL 3d space from a mouse click coordinate

You’re looking for an unproject function, which converts screen coordinates into a ray cast from the camera position into the 3D world. You must then perform ray/triangle intersection tests to find the closest triangle to the camera which also intersects the ray. I have an example of unprojecting available at jax/camera.js#L568 — but you’ll still … Read more