VdbWriter is a specific and limited writer for openvdb.
He is based on https://github.com/jangafx/simple-vdb-writer
- cross platform : Win / Linux / Macos
- cpp11 minimal support
- one header file only
- dependency free (no openvdb dependencies)
- can write multi layers format :
- float
- double
- vec3s
- vec3d
- vec3i
- vec3ui
- other format can be used by his template, but not sure if softwares can open it
- can set the current frame for animation recording +> will save in many files
the main.cpp file show you how to generate a quick file :
#include "VdbWriter.h"
int main() {
const int32_t SIZE = 150;
const double D_SIZE = (double)SIZE;
const int32_t OFFSET = SIZE;
const float Z_SCALE = 0.5f;
const int32_t FRAMES = 10;
const float len_ratio = 1.0f / (SIZE * SIZE);
vdb::VdbWriter vdb;
float r, g, b;
float time = 0.0f;
for (int32_t f = 0; f < FRAMES; ++f) {
vdb.setKeyFrame(f);
auto* floatLayerPtr = vdb.getFloatLayer(0, "density");
auto* vec3sLayerPtr = vdb.getVec3sLayer(1, "color");
for (int32_t i = -SIZE; i < SIZE; ++i) {
for (int32_t j = -SIZE; j < SIZE; ++j) {
float len = (i * i + j * j) * len_ratio;
int32_t pz = (int32_t)((std::sin(len * 10.0 + time) * 0.5 + 0.5) * (std::abs(50.0f - 25.0f * len)) * Z_SCALE);
int32_t cube_color = (int32_t)(len * 100.0) % 255 + 1;
auto px = i + SIZE;
auto py = j + SIZE;
floatLayerPtr->addVoxel(px, py, pz, 1.0f);
r = sin(len * 10.0f) * 0.5f + 0.5f;
g = sin(len * 7.0f) * 0.5f + 0.5f;
b = sin(len * 5.0f) * 0.5f + 0.5f;
vec3sLayerPtr->addVoxel(px, py, pz, r, g, b);
}
}
time += 0.5f;
}
vdb.saveToFile("wave.vdb");
}
