Skinning optimizations: order vertices by weight groups, compute mesh

space bone transforms only once per mesh per bone (rather than each time 
the bone appears in a weight group), low level fiddling.  Also changed 
the exporters to export everything, regardless of what's selected.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4081 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/ms/TRAnimationExporter.mcr

@@ -62,14 +62,8 @@ macroScript TRAnimationExporter category:"File" \
         outFile = createfile fileName
         format "<?xml version=\"1.0\" standalone=\"yes\"?>\n\n" to:outFile
         format "<animation frameRate=\"%\">\n\n" frameRate to:outFile
-        local nodes
-        if selection.count > 0 then (
-            nodes = selection
-        ) else (
-            nodes = objects
-        )
         for t = animationRange.start to animationRange.end do at time t (
-            writeFrame nodes outFile
+            writeFrame objects outFile
         )
         format "</animation>\n" to:outFile
         close outFile

src/ms/TRModelExporter.mcr

@@ -149,17 +149,9 @@ macroScript TRModelExporter category:"File" \
         outFile = createfile fileName
         format "<?xml version=\"1.0\" standalone=\"yes\"?>\n\n" to:outFile
         format "<model>\n\n" to:outFile
-        local nodes
-        oldsel = selection as array
-        if selection.count > 0 then (
-            nodes = selection
-        ) else (
-            nodes = objects
-        )
-        for node in nodes do in coordsys world (
+        for node in objects do in coordsys world (
             writeNode node outFile
         )
-        select oldsel
         format "</model>\n" to:outFile
         close outFile
     )