From ee0ec4d2bdffc2c99bd0d5e02aa243dec6d1b3a6 Mon Sep 17 00:00:00 2001
From: Sam Collier <samcollier916@gmail.com>
Date: Wed, 3 Jan 2024 12:45:04 +0000
Subject: [PATCH] allow altering transform during simulation if mass is set to
 zero (static)

---
 goop/sys/platform/bullet/Physics_Bullet.cpp | 21 +++++++++++++++
 lvl.json                                    | 30 ++++++++++-----------
 2 files changed, 36 insertions(+), 15 deletions(-)

diff --git a/goop/sys/platform/bullet/Physics_Bullet.cpp b/goop/sys/platform/bullet/Physics_Bullet.cpp
index 519b0b2..1f8236c 100644
--- a/goop/sys/platform/bullet/Physics_Bullet.cpp
+++ b/goop/sys/platform/bullet/Physics_Bullet.cpp
@@ -47,9 +47,30 @@ int Physics_Bullet::destroy()
 
 void Physics_Bullet::simulate(float dt)
 {
+	for (auto& [rbc, rb] : rigidBodies)
+	{
+		if (rbc->mass != 0)
+		{
+			continue;
+		}
+
+		auto tc = transforms[rbc];
+
+		btTransform transform;
+		transform.setIdentity();
+		transform.setOrigin(btVector3(tc->position.x, tc->position.y, tc->position.z));
+		auto rot = glm::quat(glm::radians(tc->rotation));
+		transform.setRotation(btQuaternion(rot.x, rot.y, rot.z, rot.w));
+		rb->setWorldTransform(transform);
+	}
 	dynamicsWorld->stepSimulation(dt, 10);
 	for (auto& [rbc, rb] : rigidBodies)
 	{
+		if (rbc->mass == 0)
+		{
+			continue;
+		}
+
 		btTransform transform;
 		rb->getMotionState()->getWorldTransform(transform);
 		btVector3 pos = transform.getOrigin();
diff --git a/lvl.json b/lvl.json
index 4cde32b..74085c6 100644
--- a/lvl.json
+++ b/lvl.json
@@ -7,13 +7,13 @@
             {
               "position": {
                 "x": 0.0,
-                "y": 0.0,
-                "z": -0.30000001192092896
+                "y": 2.0,
+                "z": 0.0
               },
               "rotation": {
-                "x": 0.0,
-                "y": 25.399999618530273,
-                "z": -38.20000076293945
+                "x": 23.0,
+                "y": 35.099998474121094,
+                "z": 0.0
               },
               "scale": {
                 "x": 1.0,
@@ -25,7 +25,7 @@
             {
               "path": "box",
               "primitive": "box",
-              "texturePath": "res/viking_room.png",
+              "texturePath": "res/texture.jpg",
               "type": "mesh"
             },
             {
@@ -38,20 +38,20 @@
               "type": "rigidBody"
             }
           ],
-          "name": "Viking Room"
+          "name": "Cow"
         },
         {
           "components": [
             {
               "position": {
-                "x": -1.7000000476837158,
-                "y": 0.0,
+                "x": 0.0,
+                "y": -1.0,
                 "z": 0.0
               },
               "rotation": {
-                "x": 0.0,
-                "y": 35.099998474121094,
-                "z": 0.0
+                "x": 32.0,
+                "y": -135.1999969482422,
+                "z": 24.0
               },
               "scale": {
                 "x": 1.0,
@@ -63,7 +63,7 @@
             {
               "path": "box",
               "primitive": "box",
-              "texturePath": "res/texture.jpg",
+              "texturePath": "res/viking_room.png",
               "type": "mesh"
             },
             {
@@ -72,11 +72,11 @@
                 "y": 1.0,
                 "z": 1.0
               },
-              "mass": 1.0,
+              "mass": 0.0,
               "type": "rigidBody"
             }
           ],
-          "name": "Cow"
+          "name": "Viking Room"
         }
       ],
       "name": "lvl_1"