BEPUphysics

Posted: **Sun May 22, 2011 1:30 am**

If I set the 'Orientation' property of an entity then the OrientationMatrix doesn't update immediately:

            entity.Orientation = Quaternion.CreateFromRotationMatrix(MathTools.RotationFrom(Vector3.UnitX));
            Console.WriteLine(entity.Orientation);
            Console.WriteLine(entity.OrientationMatrix.Forward);

            entity.Orientation = Quaternion.CreateFromRotationMatrix(MathTools.RotationFrom(Vector3.UnitY));
            Console.WriteLine(entity.Orientation);
            Console.WriteLine(entity.OrientationMatrix.Forward);

Result:

Code: Select all

{X:0 Y:0 Z:0 W:0.9999999}       // Orientation
{X:0 Y:0 Z:-1}                          // Orientation Matrix
{X:0 Y:0 Z:0.9999999 W:0}       // Orientation
{X:0 Y:0 Z:-1}                          // Orientation Matrix

This makes things like boids and AI rather difficult to implement with the current version of the physics engine

Posted: **Sun May 22, 2011 1:47 am**

Is that in v0.14.3? Those used to be buffered properties which would not write until the subsequent frame's write stage. The "Internal" prefixed properties were unbuffered.

In the current version, both the Orientation and OrientationMatrix properties directly get/set the internal values.

Posted: **Sun May 22, 2011 10:25 am**

I'm using the latest build with XNA 4.0, which is why it struck me as odd.

Posted: **Sun May 22, 2011 8:29 pm**

I'm using the latest build with XNA 4.0, which is why it struck me as odd.

I would recommend checking the individual values being set in detail. You can check the source for those properties- they don't do much at all. It should be fairly easy to narrow down the cause.

BEPUphysics

OrientationMatrix does not update when Orientation is set?!

OrientationMatrix does not update when Orientation is set?!

Re: OrientationMatrix does not update when Orientation is se

Re: OrientationMatrix does not update when Orientation is se

Re: OrientationMatrix does not update when Orientation is se