Adding FDrawn flag to object to flag object that has been drawn last frame. Allows for temporal computation such as prevAbsPos update to occurs only if object has FDrawn flag set to true.

h3d/pass/Output.hx

@@ -64,6 +64,7 @@ class Output {
 	function drawObject( p : h3d.pass.PassObject ) {
 		ctx.drawPass = p;
 		ctx.engine.selectMaterial(p.pass);
+		p.obj.drawn = true;
 		@:privateAccess p.obj.draw(ctx);
 	}
 

h3d/scene/Object.hx

@@ -17,6 +17,7 @@ enum abstract ObjectFlags(Int) {
 	public var FFixedPosition = 0x2000;
 	public var FFixedPositionSynced = 0x4000;
 	public var FAlwaysSync = 0x8000;
+	public var FDrawn = 0x10000;
 	public inline function new(value) {
 		this = value;
 	}
@@ -167,6 +168,11 @@ class Object {
 	**/
 	public var alwaysSync(get, set) : Bool;
 
+	/**
+		When set, the object has been drawn during previous frame. Useful for temporal effects such as temporal antialiasing.
+	**/
+	public var drawn(get, set) : Bool;
+
 	/**
 		When set, collider shape will be used for automatic frustum culling.
 		If `inheritCulled` is true, collider will be inherited to children unless they have their own collider set.
@@ -221,6 +227,7 @@ class Object {
 	inline function get_cullingColliderInherited() return flags.has(FCullingColliderInherited);
 	inline function get_fixedPosition() return flags.has(FFixedPosition);
 	inline function get_alwaysSync() return flags.has(FAlwaysSync);
+	inline function get_drawn() return flags.has(FDrawn);
 	inline function set_posChanged(b) return flags.set(FPosChanged, b || follow != null);
 	inline function set_culled(b) return flags.set(FCulled, b);
 	inline function set_visible(b) return flags.set(FVisible,b);
@@ -236,6 +243,7 @@ class Object {
 	inline function set_cullingColliderInherited(b) return flags.set(FCullingColliderInherited, b);
 	inline function set_fixedPosition(b) return flags.set(FFixedPosition, b);
 	inline function set_alwaysSync(b) return flags.set(FAlwaysSync, b);
+	inline function set_drawn(b) return flags.set(FDrawn, b);
 
 	/**
 		Create an animation instance bound to the object, set it as currentAnimation and play it.
@@ -813,12 +821,14 @@ class Object {
 		}
 
 		var prevForcedScreenRatio : Float = ctx.forcedScreenRatio;
-		if ( !ctx.computeVelocity || fixedPosition || culled )
+		if ( !drawn || !ctx.computeVelocity || fixedPosition || culled  )
 			prevAbsPosFrame = NO_VELOCITY;
 		else if ( prevAbsPosFrame == NO_VELOCITY )
 			prevAbsPosFrame = VELOCITY;
-		if( !culled || ctx.computingStatic )
+		if( !culled || ctx.computingStatic ) {
 			emit(ctx);
+			drawn = false;
+		}
 
 		for( c in children )
 			c.emitRec(ctx);