Tilt cubes along the waves.

draw_cubes.cpp

Vec3 center = pos + CalcGerstnerWaveOffset(immutableCb, pos, terrainFrameCB.g_time);
Vec3 offsetXZ = pos + Vec3(1, 0, 1) + CalcGerstnerWaveOffset(immutableCb, pos + Vec3(1, 0, 1), terrainFrameCB.g_time);
Vec3 offsetNegX = pos + Vec3(-1, 0, 0) + CalcGerstnerWaveOffset(immutableCb, pos + Vec3(-1, 0, 0), terrainFrameCB.g_time);
Vec3 offsetNegZ = pos + Vec3(0, 0, -1) + CalcGerstnerWaveOffset(immutableCb, pos + Vec3(0, 0, -1), terrainFrameCB.g_time);
Vec3 normal = normalize(cross(offsetNegZ - offsetXZ, offsetNegX - offsetXZ));
Vec3 rotAxis = normalize(cross(normal, Vec3(0, 1, 0)));
float rotRad = acos(dot(normal, Vec3(0, 1, 0)));
cube.Draw(MeshXAnimResult(), scale(5, 5, 5) * q2m(Quat(rotAxis, -rotRad)) * translate(center.x, center.y, center.z));