diff --git a/src/LinearMath/btIDebugDraw.h b/src/LinearMath/btIDebugDraw.h
index e1cbf9f81..8ba955189 100644
--- a/src/LinearMath/btIDebugDraw.h
+++ b/src/LinearMath/btIDebugDraw.h
@@ -29,6 +29,7 @@ DEALINGS IN THE SOFTWARE.
 #define IDEBUG_DRAW__H
 
 #include "btVector3.h"
+#include "btTransform.h"
 
 
 ///The btIDebugDraw interface class allows hooking up a debug renderer to visually debug simulations.
@@ -52,6 +53,8 @@ class	btIDebugDraw
 		DBG_EnableSatComparison = 256,
 		DBG_DisableBulletLCP = 512,
 		DBG_EnableCCD = 1024,
+		DBG_DrawConstraints = (1 << 11),
+		DBG_DrawConstraintLimits = (1 << 12),
 		DBG_MAX_DEBUG_DRAW_MODE
 	};
 
@@ -122,6 +125,131 @@ class	btIDebugDraw
 				edgecoord[i]*=-1.f;
 		}
 	}
+	void drawTransform(const btTransform& transform, btScalar orthoLen)
+	{
+		btVector3 start = transform.getOrigin();
+		drawLine(start, start+transform.getBasis() * btVector3(orthoLen, 0, 0), btVector3(0.7f,0,0));
+		drawLine(start, start+transform.getBasis() * btVector3(0, orthoLen, 0), btVector3(0,0.7f,0));
+		drawLine(start, start+transform.getBasis() * btVector3(0, 0, orthoLen), btVector3(0,0,0.7f));
+	}
+
+	void drawArc(const btVector3& center, const btVector3& normal, const btVector3& axis, btScalar radiusA, btScalar radiusB, btScalar minAngle, btScalar maxAngle, 
+				const btVector3& color, bool drawSect, btScalar stepDegrees = btScalar(10.f))
+	{
+		const btVector3& vx = axis;
+		btVector3 vy = normal.cross(axis);
+		btScalar step = stepDegrees * SIMD_RADS_PER_DEG;
+		int nSteps = (int)((maxAngle - minAngle) / step);
+		if(!nSteps) nSteps = 1;
+		btVector3 prev = center + radiusA * vx * btCos(minAngle) + radiusB * vy * btSin(minAngle);
+		if(drawSect)
+		{
+			drawLine(center, prev, color);
+		}
+		for(int i = 1; i <= nSteps; i++)
+		{
+			btScalar angle = minAngle + (maxAngle - minAngle) * btScalar(i) / btScalar(nSteps);
+			btVector3 next = center + radiusA * vx * btCos(angle) + radiusB * vy * btSin(angle);
+			drawLine(prev, next, color);
+			prev = next;
+		}
+		if(drawSect)
+		{
+			drawLine(center, prev, color);
+		}
+	}
+	void drawSpherePatch(const btVector3& center, const btVector3& up, const btVector3& axis, btScalar radius, 
+		btScalar minTh, btScalar maxTh, btScalar minPs, btScalar maxPs, const btVector3& color, btScalar stepDegrees = btScalar(10.f))
+	{
+		btVector3 vA[74];
+		btVector3 vB[74];
+		btVector3 *pvA = vA, *pvB = vB, *pT;
+		btVector3 npole = center + up * radius;
+		btVector3 spole = center - up * radius;
+		btScalar step = stepDegrees * SIMD_RADS_PER_DEG;
+		const btVector3& kv = up;
+		const btVector3& iv = axis;
+		btVector3 jv = kv.cross(iv);
+		bool drawN = false;
+		bool drawS = false;
+		if(minTh <= -SIMD_HALF_PI)
+		{
+			minTh = -SIMD_HALF_PI + step;
+			drawN = true;
+		}
+		if(maxTh >= SIMD_HALF_PI)
+		{
+			maxTh = SIMD_HALF_PI - step;
+			drawS = true;
+		}
+		if(minTh > maxTh)
+		{
+			minTh = -SIMD_HALF_PI + step;
+			maxTh =  SIMD_HALF_PI - step;
+			drawN = drawS = true;
+		}
+		int n_hor = (int)((maxTh - minTh) / step) + 1;
+		if(n_hor < 2) n_hor = 2;
+		btScalar step_h = (maxTh - minTh) / btScalar(n_hor - 1);
+		if(minPs > maxPs)
+		{
+			minPs = -SIMD_PI + step;
+			maxPs =  SIMD_PI;
+		}
+		int n_vert = (int)((maxPs - minPs) / step) + 1;
+		if(n_vert < 2) n_vert = 2;
+		btScalar step_v = (maxPs - minPs) / btScalar(n_vert - 1);
+		for(int i = 0; i < n_hor; i++)
+		{
+			btScalar th = minTh + btScalar(i) * step_h;
+			btScalar sth = radius * btSin(th);
+			btScalar cth = radius * btCos(th);
+			for(int j = 0; j < n_vert; j++)
+			{
+				btScalar psi = minPs + btScalar(j) * step_v;
+				btScalar sps = btSin(psi);
+				btScalar cps = btCos(psi);
+				pvB[j] = center + cth * cps * iv + cth * sps * jv + sth * kv;
+				if(i)
+				{
+					drawLine(pvA[j], pvB[j], color);
+				}
+				else if(drawS)
+				{
+					drawLine(spole, pvB[j], color);
+				}
+				if(j)
+				{
+					drawLine(pvB[j-1], pvB[j], color);
+				}
+				if((i == (n_hor - 1)) && drawN)
+				{
+					drawLine(npole, pvB[j], color);
+				}
+				if( ((!i) || (i == (n_hor-1))) && ((!j) || (j == (n_vert-1))))
+				{
+					drawLine(center, pvB[j], color);
+				}
+			}
+			pT = pvA; pvA = pvB; pvB = pT;
+		}
+	}
+	
+	void drawBox(const btVector3& bbMin, const btVector3& bbMax, const btVector3& color)
+	{
+		drawLine(btVector3(bbMin[0], bbMin[1], bbMin[2]), btVector3(bbMax[0], bbMin[1], bbMin[2]), color);
+		drawLine(btVector3(bbMax[0], bbMin[1], bbMin[2]), btVector3(bbMax[0], bbMax[1], bbMin[2]), color);
+		drawLine(btVector3(bbMax[0], bbMax[1], bbMin[2]), btVector3(bbMin[0], bbMax[1], bbMin[2]), color);
+		drawLine(btVector3(bbMin[0], bbMax[1], bbMin[2]), btVector3(bbMin[0], bbMin[1], bbMin[2]), color);
+		drawLine(btVector3(bbMin[0], bbMin[1], bbMin[2]), btVector3(bbMin[0], bbMin[1], bbMax[2]), color);
+		drawLine(btVector3(bbMax[0], bbMin[1], bbMin[2]), btVector3(bbMax[0], bbMin[1], bbMax[2]), color);
+		drawLine(btVector3(bbMax[0], bbMax[1], bbMin[2]), btVector3(bbMax[0], bbMax[1], bbMax[2]), color);
+		drawLine(btVector3(bbMin[0], bbMax[1], bbMin[2]), btVector3(bbMin[0], bbMax[1], bbMax[2]), color);
+		drawLine(btVector3(bbMin[0], bbMin[1], bbMax[2]), btVector3(bbMax[0], bbMin[1], bbMax[2]), color);
+		drawLine(btVector3(bbMax[0], bbMin[1], bbMax[2]), btVector3(bbMax[0], bbMax[1], bbMax[2]), color);
+		drawLine(btVector3(bbMax[0], bbMax[1], bbMax[2]), btVector3(bbMin[0], bbMax[1], bbMax[2]), color);
+		drawLine(btVector3(bbMin[0], bbMax[1], bbMax[2]), btVector3(bbMin[0], bbMin[1], bbMax[2]), color);
+	}
 };