[WebCast 培训] Day 4 - 3ds Max - Webcast Training

1、 2009 Autodesk 1The Reference* Hierarchy 3ds Max webcast training Day 4 Stephen Taylor* Not to be confused with Animatable 2009 Autodesk 2The Animatable Hierarchy In 13 words or less! 2009 Autodesk 3The Animatable Hierarchy (Review) ReuseREUSE1 2009 Autodesk 4The Animatable Hierarchy (Review) Reuse

2、existing EXISTING2 2009 Autodesk 5The Animatable Hierarchy (Review) Reuse existing classes CLASSES3 2009 Autodesk 6The Animatable Hierarchy (Review) Reuse existing classes. Expose EXPOSE4 2009 Autodesk 7The Animatable Hierarchy (Review) Reuse existing classes. Expose as AS5 2009 Autodesk 8The Animat

3、able Hierarchy (Review) Reuse existing classes. Expose as SubAnim SUBANIM6 2009 Autodesk 9The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim toTO7 2009 Autodesk 10The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to allow ALLOW8 2009 Autodesk 11The

4、Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to allow user USER9 2009 Autodesk 12The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to allow user toTO10 2009 Autodesk 13The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to

5、allow user to viewVIEW11 2009 Autodesk 14The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to allow user to view and AND12 2009 Autodesk 15The Animatable Hierarchy (Review) Reuse existing classes. Expose as SubAnim to allow user to view and control.CONTROL13 2009 Autodesk 1

6、6The Animatable Hierarchy 2009 Autodesk 17Todays Goal Create a billboard effect Find a Camera to look-at Use References to update calculation 2009 Autodesk 18Todays Goal Create a billboard effectWe will apply this with a Rotation controller Find a Camera to look-at Use References to update calculati

7、on 2009 Autodesk 19Todays Goal Create a billboard effectWe will apply this with a Rotation controller Find a Camera to look-atIterate the scene to find a particular object Use References to update calculation 2009 Autodesk 20Introducing The Sample 2009 Autodesk 21Introducing the Sample 2009 Autodesk

8、 22Introducing the Sample 2009 Autodesk 23Introducing the Sample 2009 Autodesk 24Finding a Camera A Camera is an Object Objects Live on Nodes All Nodes are part of the Scene TreeJoined through Parent/Child relationships GetCOREInterface 2009 Autodesk 25Finding a CameraINodeINodeINodeINodeINodeINodeL

9、ightGeometryCameraGeometry 2009 Autodesk 26Finding a CameraFindCamera(node): If node has Camera return Camera foreach child FindCamera(child)FindCamera (rootnode)INodeINodeINodeINodeINodeINodeLightGeometryCameraGeometry 2009 Autodesk 27Finding a Camera (Task 1 of 3)INodeINodeINodeINodeINodeINodeLigh

10、tGeometryCameraGeometryComplete FindCamearNode: - Recursively iterate tree - Return INode if found 2009 Autodesk 28Finding a Camera (Task 1 of 3)INodeINodeINodeINodeINodeINodeLightGeometryCameraGeometryComplete FindCamearNode: - Recursively iterate tree - Return INode if foundChange feedback to Red

11、when done 2009 Autodesk 29Now What? GetValue is not being called enoughIs called during animationNot called while user changing Deleting the camera causes a crashHanging pointer 2009 Autodesk 30BaseObjectModifierObjectGeomObjectCameraObjecLightObjectHelperObjectControlStdControlMtlBaseMtlTexMapRende

12、rerSpecialFXAtmosphericBaseShaderLife-time control, Messaging,Monitoring, File IOIdentification, Parameter definitionAnimatableReferenceMakerReferenceTargetClassDesc2ParamBlockDesc2IParamBlock2UtilityObjGupSceneExportSceneImport 2009 Autodesk 31References Creates a dependency between 2 instancesOne

13、instance (maker) watches another (target)Target notifies maker when it changesNotifyDependentsReferenceMakerReferenceTargetUpdate yourself I have changedI depend on your values 2009 Autodesk 32References Creates a dependency between 2 instancesOne instance (maker) watches another (target)Target noti

14、fies maker when it changesNotifyDependents Controls instance life-timeReleasing all references to a target causes target to release.ReferenceMakerReferenceTargetMy services are no longer needed:I will be released nowThis reference is being released 2009 Autodesk 33How To Turn a Pointer into a Refere

15、nce Max Implements:ReplaceReference We Implement:ReferenceMaker:NumRefsReferenceMaker:SetReferenceReferenceMaker:GetReference 2009 Autodesk 34How to turn a pointer into a Reference (Task 2 of 3) Make m_pCamNode a referenceint ReferenceMaker:NumRefs ( )ReferenceTarget* ReferenceMaker:GetReference(int

16、 i) void ReferenceMaker:SetReference (int i, ReferenceTarg rtarg )See the comments in the source for detailed instructionsChange feedback to Yellow when done 2009 Autodesk 35Creating a Reference (Task 3 of 3) Currently: m_pCamNode value is simply assigned Change To: m_pCamNode is a Reference (Task 2

17、) Assign its value through Max mechanisms for managing ReferencesSee comments in code for detailed instructionsChange feedback to Green when done 2009 Autodesk 36How does Max do it? Class ReferenceTargetRefList simple LinkedListReplaceReference Maintains RefListNotifyDependents Iterates RefListMaybe

18、AutoDelete Empty RefList 2009 Autodesk 37How does Max do it? Class ReferenceTargetRefList simple LinkedListReplaceReference Maintains RefListNotifyDependents Iterates RefListMaybeAutoDelete Empty RefList Do NOT call SetReference directly Do NOT delete objects 2009 Autodesk 38Processing Messages NotifyRefChanged processes messages from our References Allows us to respond to changes on the targeIt will tell us if the camera is deleted 2009 Autodesk 39Final Thoughts. We create the reference, but never use it. Someho