+ hook up a few more parameters, that can be useful for Bullet soft bodies

+ work-in-progress to hook up cluster constraints (they are better than node/vertex pinning, because they maintain a proper world coordinate system)

source/blender/src/buttons_logic.c

@@ -3006,7 +3006,7 @@ static uiBlock *advanced_bullet_menu(void *arg_ob)
 			xco = 0;
 			uiDefButF(block, NUMSLI, 0, "LinStiff", xco, yco, 238, 19, 
 				&ob->bsoft->linStiff, 0.0, 1.0, 1, 0,
-				"Linear stiffness of the soft body vertex spring");
+				"Linear stiffness of the soft body links");
 			yco -= 25;
 			xco = 0;
 
@@ -3027,9 +3027,35 @@ static uiBlock *advanced_bullet_menu(void *arg_ob)
 				xco+=120, yco, 118, 19, &ob->bsoft->collisionflags, 0, 0, 0, 0, 
 				"Enable cluster collision between soft and soft body");
 			yco -= 25;
+			xco = 0;
+			uiDefButI(block, NUM, REDRAWVIEW3D, "Clus.It.",		
+				xco, yco, 118, 19, &ob->bsoft->numclusteriterations, 1.0, 128., 
+				0, 0, "Specify the number of cluster iterations");
+
+			uiDefButI(block, NUM, REDRAWVIEW3D, "piterations",		
+				xco+=120, yco, 118, 19, &ob->bsoft->piterations, 0, 10, 
+				0, 0, "Position solver iterations");
+
+			yco -= 25;
+			xco = 0;
+			uiDefButF(block, NUMSLI, REDRAWVIEW3D, "Friction",		
+				xco, yco, 118, 19, &ob->bsoft->kDF, 0.0, 1., 
+				0, 0, "Dynamic Friction");
+
+			uiDefButF(block, NUMSLI, REDRAWVIEW3D, "kMT",		
+				xco+=120, yco, 118, 19, &ob->bsoft->kMT, 0, 1,
+				0, 0, "Pose matching coefficient");
+
+			/*
+			//too complex tweaking, disable for now
+			uiDefButF(block, NUMSLI, REDRAWVIEW3D, "kVC",		
+				xco+=80, yco, 80, 19, &ob->bsoft->kVC, 0, 100,
+				0, 0, "Volume coefficient");
+			*/
 
 			xco = 0;
 /*
+//would be a cool option, like leaves in the wind, need complex tweaking
 			uiDefButBitI(block, TOG, OB_BSB_AERO_VTWOSIDE, 0, "Aero model",
 				xco, yco, 118, 19, &ob->bsoft->flag, 0, 0, 0, 0,
 				"Enable aero model, vertex normals are flipped to match velocity");
@@ -3037,18 +3063,6 @@ static uiBlock *advanced_bullet_menu(void *arg_ob)
 			yco -= 25;
 */
 
-
-			
-			/*
-			uiDefButF(block, NUMSLI, 0, "AngStiff ", xco, yco, 238, 19, 
-			&ob->bsoft->angStiff, 0.0, 1.0, 1, 0, 
-			"Angular stiffness of the soft body vertex spring");
-			yco -= 25;
-			uiDefButF(block, NUMSLI, 0, "Volume ", xco, yco, 238, 19, 
-			&ob->bsoft->volume, 0.0, 1.0, 1, 0, 
-			"Factor of soft body volume preservation");
-			*/
-
 		}
 
 	} else

source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.cpp

@@ -1531,6 +1531,46 @@ int			CcdPhysicsEnvironment::createConstraint(class PHY_IPhysicsController* ctrl
 		btVector3 pivotPointSoftWorld = sb0->m_initialWorldTransform(pivotInA);
 		int node=findClosestNode(sb0,pivotPointSoftWorld);
 		if (node >=0)
+		{
+			bool clusterconstaint = false;
+/*
+			switch (type)
+			{
+			case PHY_LINEHINGE_CONSTRAINT:
+				{
+					if (sb0->clusterCount() && rb1)
+					{
+						btSoftBody::LJoint::Specs	ls;
+						ls.erp=0.5f;
+						ls.position=sb0->clusterCom(0);
+						sb0->appendLinearJoint(ls,rb1);
+						clusterconstaint = true;
+						break;
+					}
+				}
+			case PHY_GENERIC_6DOF_CONSTRAINT:
+				{
+					if (sb0->clusterCount() && rb1)
+					{
+						btSoftBody::AJoint::Specs as;
+						as.erp = 1;
+						as.cfm = 1;
+						as.axis.setValue(axisX,axisY,axisZ);
+						sb0->appendAngularJoint(as,rb1);
+						clusterconstaint = true;
+						break;
+					}
+
+					break;
+				}
+			default:
+				{
+				
+				}
+			};
+			*/
+
+			if (!clusterconstaint)
 			{
 				if (rb1)
 				{
@@ -1540,6 +1580,9 @@ int			CcdPhysicsEnvironment::createConstraint(class PHY_IPhysicsController* ctrl
 					sb0->setMass(node,0.f);
 				}
 			}
+
+			
+		}
 		return 0;//can't remove soft body anchors yet
 	}
 
@@ -1548,6 +1591,48 @@ int			CcdPhysicsEnvironment::createConstraint(class PHY_IPhysicsController* ctrl
 		btVector3 pivotPointAWorld = colObj0->getWorldTransform()(pivotInA);
 		int node=findClosestNode(sb1,pivotPointAWorld);
 		if (node >=0)
+		{
+			bool clusterconstaint = false;
+
+			/*
+			switch (type)
+			{
+			case PHY_LINEHINGE_CONSTRAINT:
+				{
+					if (sb1->clusterCount() && rb0)
+					{
+						btSoftBody::LJoint::Specs	ls;
+						ls.erp=0.5f;
+						ls.position=sb1->clusterCom(0);
+						sb1->appendLinearJoint(ls,rb0);
+						clusterconstaint = true;
+						break;
+					}
+				}
+			case PHY_GENERIC_6DOF_CONSTRAINT:
+				{
+					if (sb1->clusterCount() && rb0)
+					{
+						btSoftBody::AJoint::Specs as;
+						as.erp = 1;
+						as.cfm = 1;
+						as.axis.setValue(axisX,axisY,axisZ);
+						sb1->appendAngularJoint(as,rb0);
+						clusterconstaint = true;
+						break;
+					}
+
+					break;
+				}
+			default:
+				{
+					
+
+				}
+			};*/
+
+
+			if (!clusterconstaint)
 			{
 				if (rb0)
 				{
@@ -1557,6 +1642,9 @@ int			CcdPhysicsEnvironment::createConstraint(class PHY_IPhysicsController* ctrl
 					sb1->setMass(node,0.f);
 				}
 			}
+			
+
+		}
 		return 0;//can't remove soft body anchors yet
 	}