GEEKING

App/v8datamodel/AnimatableRootJoint.cpp

@@ -0,0 +1,54 @@
+#include "stdafx.h"
+
+#include "V8DataModel/AnimatableRootJoint.h"
+
+using namespace RBX;
+
+AnimatableRootJoint::AnimatableRootJoint(const shared_ptr<PartInstance>& part)
+: IAnimatableJoint(), part(part)
+  ,isAnimating(false)
+{
+}
+
+void AnimatableRootJoint::setAnimating(bool value)
+{
+	if(isAnimating  != value && value)
+	{
+		// reset.
+		lastCFrame = CoordinateFrame();
+	}
+	isAnimating = value;
+}
+
+const std::string& AnimatableRootJoint::getParentName()
+{
+	return IAnimatableJoint::sROOT;
+}
+
+const std::string& AnimatableRootJoint::getPartName()
+{
+	return part->getName();
+}
+
+void AnimatableRootJoint::applyPose(const CachedPose& pose)
+{
+	//nb: we completely ignore blend weights unless they are zero
+	//nb: we ignore maskWeight and pretend it is 1. (since we don't prevent physics from acting)
+	CoordinateFrame poseCFrame = pose.getCFrame();
+	if(pose.weight > 0)
+	{
+		// to let physics act on the part, we extract the change from last frame.
+		// then just apply the change.
+		// toObjectSpace is this->inverse() * c;
+		// delta = last^-1 * pose
+		// newcframe = currentcframe * delta
+		// newcframe = currentcframe * last^-1 * pose
+		// so if currentcframe == last (eg: part was anchored), then
+		// newcframe = pose 
+		CoordinateFrame delta = lastCFrame.toObjectSpace(poseCFrame);
+		
+		part->setCoordinateFrame(part->getCoordinateFrame() * delta);
+	}
+
+	lastCFrame = poseCFrame;
+}