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How to use RWR voxel editor
this is explained on running with rifles forums topic:  this is copy pasted text from the first post by pasik:
Here's some hints for the usage:
rwr_editor.exe [model XML file] [animation XML file] * When launching the editor, an OGRE dialog pops up: select the Rendering subsystem, there's only one choice. I'd also recommend using the tool in non-fullscreen mode. Click OK to run the editor. * If the editor is launched without command line parameters, the editing happens on a model file "new.xml". If such file doesn't exist, it will be created when the model is saved.
- Keys and other tips:
* General: ASDW: move around Left shift + ASDW: move around faster Left shift + Mouse: turn camera Ctrl-S: save both model and animation files 1: Model view 2: Animation view, can be used only if the editor has been launched with a model with a skeleton O: experimental magic tool that can be used to remove voxels that can't be seen from anywhere -- takes a long time to process, better save before doing this, not 100% foolproof, may also end up removing wrong voxels ALT-F4: quit :)
* Model view: * Edit voxels -tool: Left mouse button: add voxel Right mouse button: remove voxel * Select voxels -tool: Left mouse button drag: 1# define a rectangle selector for voxels 2# drag voxels around using the axis handles
* To paint voxels, click on the current color indicator panel * When working with a model with a skeleton, and making modifications to the model, click "Re-bind skeleton" to attach the new voxels to the skeleton
* Animation view: Left and right arrows: previous / next keyframe Up and down arrows: previous / next animation * Select & move -tool: Left mouse button drag: 1# define a rectangle selector for bone points which will be made movable 2# drag single bone point around and the other movable points will follow
* To add a keyframe, click on the timeline, and displace a bone point
* Currently, there's no playback button: simulate playback by dragging the timeline slider