BlenderWorkshopIMALAugust2017 date and time

Own objectives

  1. integration with WebXR (import/export)
  2. work with existing models from the WebVR or exported from in VR modelling tools

Attended activities

Taught by François Zajéga

Basis of the interface for modelling (Tuesday)

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Modifiers (Wednesday)

  • knife
    • cut through Shift+k
    • cut along a axis c
    • duplicate the selection Shift+d (just like to duplicate an object)
    • alternatively
      • Edit Mode on a cylinder, sphere, etc Loop cut and slide tool allow to cut in multiple places and with smoothness
  • select "neighbours" edges
    • Ctrl++ to add vertices
    • select 2 vertices then select next one using @Ctrl+Shift++@
    • select 3 vertices > Select > Edge loops
  • snapping
    • toggle on/off using Shift+Tab
    • on grid, on vertices, faces, etc
  • adding a primitive in Edit Mode adds it to the current object
  • moving between layers 0123456789
  • Modifiers
    • rules
      • can be compounded
      • order matters
      • good habit to duplicate in another layer before applying
      • exporters support Modifiers application
        • e.g glTF option
      • can be applied to only a Vertex Group
    • Array to repeat an object
      • uses a reference until the modifier is applied
        • once applied possible to use in Edit mode and modify all vertices
    • Fit to curve
      • Apply an array-ed segment (e.g. cyclinder) to curve (e.g. Bezier curve)
      • Fill Holes can be useful it spacing left after Array modifier
    • Lattice to deform linked to a controlling cube
    • Mirror to work on half the object
  • Sculpt mode
    • enable dynamic topology to automatically add faces
    • specify Matcap to have target shading while sculpting
  • result

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More Modifiers and Scripting (Thursday)

  • Modifier Mesh Deform to go further than Lattice modifier
    • add bounding cube
    • in the Object > Display > Maximum Draw Type: Wire
      • to avoid hiding the modified object
    • bind then wait, takes time
    • change the vertices of the modifier
    • Apply as Shape Keys
    • repeat if need be
    • find Shapes Keys in Object data
  • UV Map
    • xyz are coordinates in the 3D world
    • w was already taken
    • uv as coordinates in the 2D space of the texture
    • UV/Image editor to display the map
    • Edit Mode > Mesh > UV Unwrap > Smart UV Unwrap
    • Image > New image > Generated Type: UV grid
    • Easier to first sort the bits in the map and color them roughly and brightly, only if it does fit well then editing the target image
    • Select edges -> Mesh > Edges > Mark Seam
    • added texture
      • possibility to select a Normal map
  • Ctrl+up to expand current view, Ctrl+down to restore
  • Scripting
    • pull down the top Panel to display the log, showing function with parameters as result of actions
    • bpy.context.scene.objects.active at the last modified or created object selected
    • Text Editor
      • set syntax highlighting, line number, ...
      • print() result in the terminal used to start Blender
      • Alt+p to run script
      • saved content in the .blend file
    • interactive console, open with Shfit+F4
      • Ctrl+space to auto complete
    • Outliner
      • Data-Blocks to display data
    • on interface
      • Right click to get Copy Python Command then be able to paste in the editor
  • animation
    • Timeline
      • insert a key frame by selecting the right moment, hovering over a value (e.g. location) then i and changing that value
    • can be applied over multiple values e.g. location and scale
      • right click on the value at the keyframe > Delete Keyframe
      • right click on the value at the keyframe > Insert Single Keyframe (to avoid having all values)
    • Graph Editor
      • rescale axis using its sides per object
      • select all points > Key > Interpolation Mode > Linear
    • using Empty object as pivot
  • Outliners
    • possible to display only objects in visible layers
  • headless
    • blender -b -P myscript.py
  • result

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3D Printing, Rendering and more (Friday)

  • 3D printing
  • Rendering
    • displaying from the camera point of view Numpad 0
    • show the last render UV/Image Editor
      • can assign different render per slot in order to quickly compare
      • using 0123456789 allows to quickly jump from one to another
    • use Lock Camera to View to be able to move the view in camera point of view and have the camera be moved accordingly
    • importance and problems of clipping
    • depth of field
      • can attach an empty object to the camera and link the Depth of field target to it
    • resolution by default is only at 50%, easier for quasi preview
    • modifier World to change sky color, myst, ...
    • for video set up your animation then test using AVI RAW for faster test
      • can also encode using other tools later e.g. ffmpeg
  • mixing Blender files with Append Shift+F1
    • possibility to use Link instead to use a reference rather than a copy
  • Skinning & Rigging
    • create object with enough vertices to bend
    • add Armature
      • Extrude to add another bone
      • which is a Deform Modifier
        • can become a Shape Key
    • can use X-ray
    • Object > Parent Ctrl+p > With automatic weight
    • use Weight Paint to restrict to a smaller (or bigger) section
    • use Pose to move the bones
    • similar result possible solely using hierarchy only for non organic object
      • for those with a "skin" that has to be deformed a proper rigging system with bones and skins is required
    • to get rigged characters see http://www.makehuman.org
  • result

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Overall remarks and conclusions

  • meet him
  • could be improved by doing that
  • see also that other event

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Other reviews or coverage

To do

  1. check MarmosetView to see layers
  2. check computerphile https://www.youtube.com/watch?v=KdyvizaygyY
  3. write blog post for A-Frame/WebVR usage (could follow a model like http://viruspatterns.com )
    1. cf Blender
  4. LoD batch decimate based on earlier script
    1. http://vatelier.net/MyDemo/AdaptiveScalingFromBatchGeometries/
  5. export to AFrame? generate placeholder HTML + export to glTF and include it