rigidbody: Add rigid body simulation

Add operators to add/remove rigid body world and objects.
Add UI scripts.

The rigid body simulation works on scene level and overrides the
position/orientation of rigid bodies when active.
It does not deform meshes or generate data so there is no modifier.

Usage:
* Add rigid body world in the scene tab
* Create a group
* Add objects to the group
* Assign group to the rigid body world
* Play animation
For convenience the rigid body tools operators in the tools panel of the 3d view
will add a world, group and add objects to the group automatically so you only have
to press one button to add/remove rigid bodies to the simulation.

Part of GSoC 2010 and 2012.
Authors: Joshua Leung (aligorith), Sergej Reich (sergof)

1 files changed, 210 insertions, 0 deletions

diff --git a/source/blender/editors/physics/rigidbody_world.c b/source/blender/editors/physics/rigidbody_world.c
new file mode 100644
index 00000000000..068f8decef5
--- /dev/null
+++ b/source/blender/editors/physics/rigidbody_world.c
@@ -0,0 +1,210 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. 
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Joshua Leung, Sergej Reich
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+ 
+/** \file rigidbody_world.c
+ *  \ingroup editor_physics
+ *  \brief Rigid Body world editing operators
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "DNA_object_types.h"
+#include "DNA_rigidbody_types.h"
+#include "DNA_scene_types.h"
+
+#include "BLI_blenlib.h"
+#include "BLI_math.h"
+
+#include "RBI_api.h"
+
+#include "BKE_context.h"
+#include "BKE_depsgraph.h"
+#include "BKE_group.h"
+#include "BKE_global.h"
+#include "BKE_main.h"
+#include "BKE_report.h"
+#include "BKE_rigidbody.h"
+#include "BKE_utildefines.h"
+
+#include "RNA_access.h"
+#include "RNA_define.h"
+#include "RNA_enum_types.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "ED_physics.h"
+#include "ED_screen.h"
+
+#include "physics_intern.h"
+
+/* ********************************************** */
+/* API */
+
+/* check if there is an active rigid body world */
+static int ED_rigidbody_world_active_poll(bContext *C)
+{
+	Scene *scene = CTX_data_scene(C);
+	return (scene && scene->rigidbody_world);
+}
+static int ED_rigidbody_world_add_poll(bContext *C)
+{
+	Scene *scene = CTX_data_scene(C);
+	return (scene && scene->rigidbody_world == NULL);
+}
+
+/* ********************************************** */
+/* OPERATORS - Management */
+
+/* ********** Add RigidBody World **************** */
+
+static int rigidbody_world_add_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	Scene *scene = CTX_data_scene(C);
+	RigidBodyWorld *rbw;
+
+	rbw = BKE_rigidbody_create_world(scene);
+//	BKE_rigidbody_validate_sim_world(scene, rbw, false);
+	scene->rigidbody_world = rbw;
+
+	return OPERATOR_FINISHED;
+}
+
+void RIGIDBODY_OT_world_add(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->idname = "RIGIDBODY_OT_world_add";
+	ot->name = "Add Rigid Body World";
+	ot->description = "Add Rigid Body simulation world to the current scene";
+
+	/* callbacks */
+	ot->exec = rigidbody_world_add_exec;
+	ot->poll = ED_rigidbody_world_add_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER|OPTYPE_UNDO;
+}
+
+/* ********** Remove RigidBody World ************* */
+
+static int rigidbody_world_remove_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	RigidBodyWorld *rbw = scene->rigidbody_world;
+
+	/* sanity checks */
+	if (ELEM(NULL, scene, rbw)) {
+		BKE_report(op->reports, RPT_ERROR, "No Rigid Body World to remove");
+		return OPERATOR_CANCELLED;
+	}
+
+	BKE_rigidbody_free_world(rbw);
+	scene->rigidbody_world = NULL;
+
+	/* send updates */
+	WM_event_add_notifier(C, NC_GROUP | NA_EDITED, NULL);
+
+	/* done */
+	return OPERATOR_FINISHED;
+}
+
+void RIGIDBODY_OT_world_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->idname = "RIGIDBODY_OT_world_remove";
+	ot->name = "Remove Rigid Body World";
+	ot->description = "Remove Rigid Body simulation world from the current scene";
+
+	/* callbacks */
+	ot->exec = rigidbody_world_remove_exec;
+	ot->poll = ED_rigidbody_world_active_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER|OPTYPE_UNDO;
+}
+
+/* ********************************************** */
+/* UTILITY OPERATORS */
+
+/* ********** Export RigidBody World ************* */
+
+static int rigidbody_world_export_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	RigidBodyWorld *rbw = scene->rigidbody_world;
+	char path[FILE_MAX];
+
+	/* sanity checks */
+	if ELEM(NULL, scene, rbw) {
+		BKE_report(op->reports, RPT_ERROR, "No Rigid Body World to export");
+		return OPERATOR_CANCELLED;
+	}
+	if (rbw->physics_world == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Rigid Body World has no associated physics data to export");
+		return OPERATOR_CANCELLED;
+	}
+
+	RNA_string_get(op->ptr, "filepath", path);
+	RB_dworld_export(rbw->physics_world, path);
+
+	return OPERATOR_FINISHED;
+}
+
+static int rigidbody_world_export_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(evt))
+{
+	if (!RNA_struct_property_is_set(op->ptr, "relative_path"))
+		RNA_boolean_set(op->ptr, "relative_path", (U.flag & USER_RELPATHS));
+
+	if (RNA_struct_property_is_set(op->ptr, "filepath"))
+		return rigidbody_world_export_exec(C, op);
+
+	// TODO: use the actual rigidbody world's name + .bullet instead of this temp crap
+	RNA_string_set(op->ptr, "filepath", "rigidbodyworld_export.bullet");
+	WM_event_add_fileselect(C, op); 
+
+	return OPERATOR_RUNNING_MODAL;
+}
+
+void RIGIDBODY_OT_world_export(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->idname = "RIGIDBODY_OT_world_export";
+	ot->name = "Export Rigid Body World";
+	ot->description = "Export Rigid Body world to simulator's own fileformat (i.e. '.bullet' for Bullet Physics)";
+
+	/* callbacks */
+	ot->invoke = rigidbody_world_export_invoke;
+	ot->exec = rigidbody_world_export_exec;
+	ot->poll = ED_rigidbody_world_active_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER|OPTYPE_UNDO;
+
+	/* properties */
+	WM_operator_properties_filesel(ot, FOLDERFILE, FILE_SPECIAL, FILE_SAVE, FILE_RELPATH, FILE_DEFAULTDISPLAY);
+}