3D Computer Animation: Textures, Rigging, and Animation, Slides of Computer Graphics and Animation

Download 3D Computer Animation: Textures, Rigging, and Animation and more Slides Computer Graphics and Animation in PDF only on Docsity! Project 2 Extra Credit Docsity.com Textures in .skin file  The modified version of the .skin file with texture information will have an array of 2D texture coordinates after the array of normals texcoords [numverts] { [tx] [ty] }  If will also have a material definition that references a texture map. This will appear before the triangle array material [mtlname] { texture [texname] } Docsity.com Rigging  A rig is like a virtual puppet  A rig contains several DOFs, each corresponding to an animatable parameter within the puppet  DOFs can control:  Joint rotations, translations  Morph targets  Other things…  Higher level animation code will specify values for the DOFs (i.e., pose the rig) Docsity.com Rigging  Ultimately, the rig takes DOF values from the animation system and generates the posed geometry of the character in world space  This might involve:  Computing world joint matrices (posing the skeleton)  Interpolating verts in local space (morphing)  Transforming verts to world space (skinning)  This geometry is then rendered through a rendering system (OpenGL…) Docsity.com Rigging and Animation Animation System Pose Rigging System Triangles Renderer Docsity.com Layered Approach  We use a simple layered approach  Skeleton Kinematics  Shape Interpolation  Smooth Skinning  Most character rigging systems are based on some sort of layered system approach combined with general purpose data flow to allow for customization Docsity.com Equation Summary ( ) ( ) ( ) * * 1* 1 21 ,...,, n nn nBWn vBWv nnnn vvvv LWW LL =′′ ′⋅⋅= ′⋅⋅=′′ −⋅+=′ −⋅+=′ ⋅= = ∑ ∑ ∑ ∑ − − iii iii baseiibase baseiibase parent Njnt w w φ φ φφφ  Skeleton  Morphing  Skinning Docsity.com