Fix physics UI

Normand Briere

2019-08-06 b3ae4e889872ca0b9ca76f1d17b2f0b961226729

 cJ3D.java
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@@ -360,13 +360,13 @@
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             toParent[3][3] = m.m33;
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 	}
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+        Matrix4d m = new Matrix4d();
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+                
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         Object3D Read(TransformGroup g)
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 	{
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 		Object3D c = new Object3D(GetName(g)); // g.getClass().getName());
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                 Transform3D t = new Transform3D();
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-                
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-                Matrix4d m = new Matrix4d();
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                 g.getTransform(t);
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@@ -375,22 +375,18 @@
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                 c.toParent = LA.newMatrix();
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                 c.fromParent = LA.newMatrix();
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-                c.toParent[0][0] = m.m00;
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-                c.toParent[0][1] = m.m10;
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-                c.toParent[0][2] = m.m20;
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-                c.toParent[0][3] = m.m30;
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-                c.toParent[1][0] = m.m01;
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-                c.toParent[1][1] = m.m11;
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-                c.toParent[1][2] = m.m21;
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-                c.toParent[1][3] = m.m31;
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-                c.toParent[2][0] = m.m02;
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-                c.toParent[2][1] = m.m12;
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-                c.toParent[2][2] = m.m22;
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-                c.toParent[2][3] = m.m32;
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-                c.toParent[3][0] = m.m03;
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-                c.toParent[3][1] = m.m13;
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-                c.toParent[3][2] = m.m23;
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-                c.toParent[3][3] = m.m33;
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+                if (m.m00 != 0 || m.m10 != 0 || m.m20 != 0 || m.m30 != 0 ||
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+                    m.m01 != 0 || m.m11 != 0 || m.m21 != 0 || m.m31 != 0 ||
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+                    m.m02 != 0 || m.m12 != 0 || m.m22 != 0 || m.m32 != 0 ||
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+                    m.m03 != 0 || m.m13 != 0 || m.m23 != 0 /*|| m.m33 != 0 */)
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+                {
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+                    SetMatrix(c, m);
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+                }
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+                else
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+                {
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+                    System.err.println("Found zero scale matrix. Hide the object instead.");
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+                    c.count = 1;
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+                }
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               //  ReadNode(c, g);
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                 LA.matInvert(c.toParent, c.fromParent);
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@@ -402,6 +398,26 @@
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 		return c;
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 	}
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+
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+    private void SetMatrix(Object3D c, Matrix4d m)
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+    {
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+        c.toParent[0][0] = m.m00;
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+        c.toParent[0][1] = m.m10;
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+        c.toParent[0][2] = m.m20;
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+        c.toParent[0][3] = m.m30;
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+        c.toParent[1][0] = m.m01;
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+        c.toParent[1][1] = m.m11;
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+        c.toParent[1][2] = m.m21;
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+        c.toParent[1][3] = m.m31;
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+        c.toParent[2][0] = m.m02;
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+        c.toParent[2][1] = m.m12;
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+        c.toParent[2][2] = m.m22;
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+        c.toParent[2][3] = m.m32;
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+        c.toParent[3][0] = m.m03;
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+        c.toParent[3][1] = m.m13;
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+        c.toParent[3][2] = m.m23;
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+        c.toParent[3][3] = m.m33;
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+    }
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         Object3D Read(Scene s, String fn)
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         {