Learn about cylindrical and spherical coordinates in this 5-minute video lesson. Master the conversion techniques of these math concepts by taking an optional quiz.
So I want to create a function which takes as parameter a 3D point from sphere and calculate a uv coordinate of this point using cylindrical coordinates. My guess is that I have to transform the spherical coordinates to cylindrical but I am not sure. Is this possible and how can I implement it ?
I am implementing a type for Ogre 3D rendering engine to provide spherical coordinates. So far everything is working fine, until I try to build spherical coordinates from a cartesian vector. Here i...
@Kromster I'd disagree for this reason. Spherical projections are generally non-linear/non-affine, which means the affine texture mapping provided by per-vertex UV coordinates tends to show creases or warbles. In cases like these, using a cube map or calculating your projected coordinates in the shader can help you achieve the needed non-linearity.
Walk theta and phi in spherical coordinates, generate faces and tris Create an icosahedron and recursively subdivide faces until desired tessellation reached. Sphere using spherical coordinates walk For the first way, you just use a double nested for to walk theta and phi. As you walk theta and phi, you spin triangles to create your sphere.
// Convert to spherical coordinates: // theta is a longitude angle (around the equator) in radians. // phi is a latitude angle (north or south of the equator). float theta = texcoords[v].x * 2.0f * PI
If you see unit vectors with: two different angles (typically, θ and φ), we are using spherical coordinates. only one of the unit vectors referring to an angle, the coordinate system is cylindrical.