Light Quality in Daylit Spaces

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Light Quality in Daylit Spaces

• Analysing the flow of light in a space

Christopher Cuttles illustration of three objects
in a light field, revealing the flow of light and
sharpness of light
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The task

• ? Place the light flow meter in a major daylit
• Space.
• ? Render a view of the 3 objects in the daylit
• space and save as a .pic image.
• ? Render all 6 R-Trace objects and save the data
• Produced.
• ? Save the files onto you website and your hand
  in folders

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The light flow meterChristopher Cuttles Light
Flow Meter

• The peg on a disc reveals the shadow pattern
• The glossy black sphere reveals the highlight
  pattern
• The mat white sphere reveals the shading pattern

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The light flow meter

• The light flow meter will reveal sharpness and
  flow of light in a space.
• By using this analysis it is possible to get a
  better understanding of how light flows in a
  space, and design a lighting solution to suit the
  needs of the client.

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The scale of shadows

• What the tool is trying to produce

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The 3 objects

• The 3 objects have been modeled in Autodesk VIZ.
• The 3 objects are named shading and highlight
  sphere, and shadow gnomon.
• They are simple objects which you will need to
  import into your model. These may need scaling
  depending on your model.

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The 3 objects

• The objects can be found on the R Drive.
• You will need to add materials to the objects.
• You will need to add the calculation grids in
  using the light studio helper in VIZ

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The materials

• There are 3 materials which you will need to
  make, white matt for the white matt sphere and
  the peg on a disc
• And a black shiny material for the balck shiny
  sphere
• Both of these materials will be light studio
  materials

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Material

• White matt Use plastic, with 50 reflection
  factor, 0 specularity, and 0 roughness
• Black shiny Use metal, with 1 reflection
  factor, 1 specularity, and 0 roughness

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The R-Trace grid

• You will need to place 6 R-Trace objects into the
  scene.
• These are found under helpers, and picking light
  studio will bring up the R-Trace object to place
  in the scene.

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R-Trace grid

• Place a object by dragging in the plan view
  directly over the shading sphere, move the object
  directly at the top of the sphere still facing
  upwards, try and get it as square as possible.
• Once the first object has been placed you will
  then need to change the pivot point for the
  object, this is done through the hierarchy menu.
  By clicking affect pivot point only and using the
  move tool, move the pivot directly down to the
  centre of the white matt sphere.

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The R-Trace grids

• Once the pivot has been moved then you can
  rotate/copy the grid around the sphere as
  instances.
• Hold shift and rotate the sphere 90 degrees in
  one direction, once you let go of your mouse
  button the option to copy the object will come
  up.
• Make 3 copies and click ok.
• Once the first four grids are in place rotate two
  more grids around to fill the two gaps to produce
  6 grids which are on all sides of the sphere.
• Then select one of the grids and modify it so
  that the grid size is 1x1, and the points are
  2x2, this will make the grids very small, if they
  are the same size as the sphere then make the
  grid size .02 x .02, this will depend on the unit
  setup you have used in viz.

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The R-Trace output

• Once the model is ready you will then need to
  produce the output from the 6 grids. This is done
  through the render dialogue box for Light Studio.
  Under the render drop down box which will show
  expert or simple you need to choose rtrace, and
  make sure the illuminance check box is ticked.
• Then you will need to select each rtrace object
  and render each in turn.
• Once rendered save each grid as .txt files

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Check this box
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The .pic image

• Place a camera in the scene which is focused on
  the 3 objects, the objects need to be visible in
  the render.
• Once the camera is positioned and the materials
  added to the scene then render the camera view
  using expert (rpict), medium settings, and make
  sure illuminance is NOT checked.
• Once rendered save the image as a .pic file by
  typing .pic after the file name.

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Summary

• ? Place the light flow meter in a major daylit
  Space. Apply materials to the objects. And Place
  the R-Trace grids around the white matt sphere.
• ? Render a view of the 3 objects in the daylit
• space and save as a .pic image.
• ? Render all 6 R-Trace grids and save the data
• Produced.
• ? Save the files onto your website and your hand
  in folders