Interactive mode: new scene.flag SCE_INTERACTIVE to update the depsgraph without frame change but running physics.

Interactive button added on time line.

7 files changed, 33 insertions, 1 deletions

diff --git a/release/scripts/addons b/release/scripts/addons
-Subproject 5f7fba0565a7c9ae93eae31a08fc9bbbd16d333
+Subproject 0923bdf725b088ba584e6b1246f1ad986be436b
diff --git a/release/scripts/addons_contrib b/release/scripts/addons_contrib
-Subproject fecc0db5600405a0c14c70120ae279222861ef8
+Subproject 15b25a42783d1e516b5298d70b582fae2559ae1
diff --git a/release/scripts/startup/bl_ui/space_time.py b/release/scripts/startup/bl_ui/space_time.py
index 10cd2f6d47b..d9b0e2e6298 100644
--- a/release/scripts/startup/bl_ui/space_time.py
+++ b/release/scripts/startup/bl_ui/space_time.py
@@ -38,6 +38,8 @@ class TIME_HT_editor_buttons(Header):
 
         layout.separator_spacer()
 
+        layout.prop(scene, "use_interactive_mode", text="", icon='GAME', toggle=True)
+
         layout.prop(toolsettings, "use_keyframe_insert_auto", text="", toggle=True)
 
         row = layout.row(align=True)
diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c
index 95b558f5b43..737359aae93 100644
--- a/source/blender/blenkernel/intern/rigidbody.c
+++ b/source/blender/blenkernel/intern/rigidbody.c
@@ -1661,6 +1661,24 @@ void BKE_rigidbody_do_simulation(Depsgraph *depsgraph, Scene *scene, float ctime
 	PTCacheID pid;
 	int startframe, endframe;
 
+	if (scene->flag & SCE_INTERACTIVE) {
+		/* No caching when in interactive mode */
+		if (rbw->shared->physics_world == NULL)
+			return;
+		else if (rbw->objects == NULL)
+			rigidbody_update_ob_array(rbw);
+
+		rigidbody_update_simulation(depsgraph, scene, rbw, false);
+
+		/* TODO: get the actual time difference from previous step so that the physics simulation is real time */
+		timestep = 1.0f / (float)FPS * rbw->time_scale;
+		/* step simulation by the requested timestep, steps per second are adjusted to take time scale into account */
+		RB_dworld_step_simulation(rbw->shared->physics_world, timestep, INT_MAX, 1.0f / (float)rbw->steps_per_second * min_ff(rbw->time_scale, 1.0f));
+
+		rigidbody_update_simulation_post_step(depsgraph, rbw);
+		return;
+	}
+
 	BKE_ptcache_id_from_rigidbody(&pid, NULL, rbw);
 	BKE_ptcache_id_time(&pid, scene, ctime, &startframe, &endframe, NULL);
 	cache = rbw->shared->pointcache;
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index 9ce0956aa66..fad9990409e 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -3882,6 +3882,7 @@ static int screen_animation_step(bContext *C, wmOperator *UNUSED(op), const wmEv
 		ScrArea *sa;
 		int sync;
 		float time;
+		int pfra = scene->r.cfra;
 
 		/* sync, don't sync, or follow scene setting */
 		if (sad->flag & ANIMPLAY_FLAG_SYNC) sync = 1;
@@ -3939,7 +3940,10 @@ static int screen_animation_step(bContext *C, wmOperator *UNUSED(op), const wmEv
 		/* reset 'jumped' flag before checking if we need to jump... */
 		sad->flag &= ~ANIMPLAY_FLAG_JUMPED;
 
-		if (sad->flag & ANIMPLAY_FLAG_REVERSE) {
+		if (scene->flag & SCE_INTERACTIVE) {
+			/* TODO: remember what was the frame increment so that it can be used in physics simulation to stick to real time */
+			scene->r.cfra = pfra;
+		} else if (sad->flag & ANIMPLAY_FLAG_REVERSE) {
 			/* jump back to end? */
 			if (PRVRANGEON) {
 				if (scene->r.cfra < scene->r.psfra) {
diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 15e8f950686..0ed0ffcdc15 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1936,6 +1936,7 @@ typedef enum eVGroupSelect {
 #define SCE_NLA_EDIT_ON			(1<<2)
 #define SCE_FRAME_DROP			(1<<3)
 #define SCE_KEYS_NO_SELONLY	    (1<<4)
+#define SCE_INTERACTIVE         (1<<5)
 
 	/* return flag BKE_scene_base_iter_next functions */
 /* #define F_ERROR			-1 */  /* UNUSED */
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 11d56206d6e..c3d5b8adf13 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -6194,6 +6194,13 @@ void RNA_def_scene(BlenderRNA *brna)
 	                         "(in timeline and when jumping between keyframes)");
 	RNA_def_property_update(prop, NC_SCENE | ND_FRAME, NULL);
 
+	/* Timeline / Interactive mode */
+	prop = RNA_def_property(srna, "use_interactive_mode", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", SCE_INTERACTIVE);
+	RNA_def_property_ui_text(prop, "Run interactive mode for physics",
+	                         "The scene frame is no longer incrementing (and thus animation is stopped) but the physics engine still executes");
+	RNA_def_property_update(prop, NC_SCENE | ND_FRAME, NULL);
+
 	/* Stamp */
 	prop = RNA_def_property(srna, "use_stamp_note", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "r.stamp_udata");