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Design Realization lecture 5 John Canny 9/9/03
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Preamble Reactions to Maya? Please return the CDs soon (new material needs to be installed on them). Blog for Maya help is under construction.
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Last Time Alignment – join elements without merging. Scene graph and hierarchy. Constraints: using expressions. Shape control – blendshapes (finish today).
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Next Time We’ll have an in class “critique” of your designs-in-progress. Please make a first pass at a chair model in Maya by Thursday. Bring a laptop with your model or send it to a partner who has a laptop, so you can show your model in class.
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Shape control Maya has a tool for controlling parametric shape called Blendshapes. (Animation) Deform → Blend Shapes Trick: by default Blendshapes ignores the transform hierarchy. it only responds to control point deformation. Changing that default makes it behave obviously.
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Materials and texture Maya includes rich material models (aka shaders) for common materials. Some will be on the next CD update. A material includes attributes like Type: Phong, Blinn – models of reflection (shine). Color: obvious – usually a texture. Transparency: can be fixed or a texture. Bump map: adjustment of surface normals. Displacement map: adjustment of surface depth.
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Texture coordinates A texture can be any 2D image. Can be grabbed from clipart, from photographs or scanners, or can be a synthetic image. 2D images have X, Y coordinates. NURB surfaces have U, V coordinates which are used to “map” the texture. Isoparm curves on surfaces show the U, V directions. Checkerboard or brick textures are a good way to learn mapping techniques.
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From shape to movement… Motion is one of the most expressive forms available to a designer. Animation literally means “to give life”.
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Qualities of movement List some…
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Qualities of movement Hint: What are “good” movements?
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Keyframing Keyframing is the traditional digital method for animation. The scene is posed at all significant transitions and sample poses. Then the animation code interpolates between them. Motion curves (trajectories) can be edited much like NURB curves.
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Movement composition In character animation, movements are not atomic. They break down as: Anticipation Action Reaction Example: Jumping block.
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Morphing and moving A general shape deformer like Blendshapes can be used to pose a complex model. Its relatively easy to use Blendshapes plus keyframing to animate a face. Create a new copy of the face and set it to each facial expression, then blend with Blendshape to create an expression control.
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Todo Work on your chair designs for Thursday. Find a partner if needed for in-class demo. Please return the CDs soon.
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