I'm new to C and want to define a mesh struct containing position, rotation, scale, color, layer, and two arrays: one for vertex data and one for faces. The arrays won't always have the same length, so fixed-size declarations such as float vertices[99] and int faces[99] aren't suitable. What's the most memory-efficient way to let each mesh hold a variable number of elements and grow when necessary?
1 Answer
A typical definition would look like this: struct mesh { float px, py, pz; float rx, ry, rz; float sx, sy, sz; char *color; int layer; float *vertices; size_t vertex_count; int *faces; size_t face_count; }; Then allocate the arrays based on the counts you need, for example with calloc(count, sizeof *mesh.vertices). This avoids reserving unused space and lets the two arrays have independent sizes.
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