Particles: Create a simulation state for every Particle Simulation node

Every Particle Simulation node has a name (or a path when it is in a node group).
This name has to be used in the Simulation modifier on a point cloud to see
the particles.

Caching has been disabled for now, because it was holding back development
a bit. To reset the simulation, go back to frame 1.

Currently, there is no way to influence the simulation. There are just some
randomly moving points. Changing that is the next step.

2 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 274d56ac5f7..44a1a6ec44a 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -8686,6 +8686,7 @@ static void direct_link_simulation(BlendDataReader *reader, Simulation *simulati
 
   BLO_read_list(reader, &simulation->states);
   LISTBASE_FOREACH (SimulationState *, state, &simulation->states) {
+    BLO_read_data_address(reader, &state->name);
     switch ((eSimulationStateType)state->type) {
       case SIM_STATE_TYPE_PARTICLES: {
         ParticleSimulationState *particle_state = (ParticleSimulationState *)state;
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index 2ce8abff3c5..4e2b4fef9a0 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -3832,6 +3832,7 @@ static void write_simulation(BlendWriter *writer, Simulation *simulation, const
     }
 
     LISTBASE_FOREACH (SimulationState *, state, &simulation->states) {
+      BLO_write_string(writer, state->name);
       switch ((eSimulationStateType)state->type) {
         case SIM_STATE_TYPE_PARTICLES: {
           ParticleSimulationState *particle_state = (ParticleSimulationState *)state;