vec4 method
Writes a vec4 at offset.
Implementation
void vec4(int offset, double x, double y, double z, double w) {
bytes
..setFloat32(offset, x, Endian.host)
..setFloat32(offset + 4, y, Endian.host)
..setFloat32(offset + 8, z, Endian.host)
..setFloat32(offset + 12, w, Endian.host);
}