LDCad 1.4 Beta 2 (win+linux)

[Roland Melkert]

I've looked into this a bit more and it turns out it's not a group matrix bug, it's event related. Nesting is fun but all the internal matrix stuff introduced rounding problems in my early alpha's after a couple of frames so I implemented caching etc. Problem is the current version only initializes this cache when the start event is used in your script. This is why my examples all work fine

Anyhow a workaround is very simple, just add a (dummy) start event handler. Here is your corrected script it should work on your existing model without problems now.

Code:

function register()
  local ani=ldc.animation('42020-B')
  ani:setLength(5)
  ani:setEvent('frame', 'onFrame')
  ani:setEvent('start', 'onStart')
end

function onStart()
  --grp ori bug prevention
end
  
function onFrame()
  local ani=ldc.animation.getCurrent()
  local mainSf=ldc.subfile()
  local ori=ldc.matrix()

  local angle=720*ani:getFrameTime()/ani:getLength()
  
  ax1=mainSf:getGroup('crank')
  ori:set(0, 0, 1, 0, 1, 0, -1, 0, 0) --group has non id main item
  ori:mulRotateAB(angle, 1, 0, 0)
  ax1:setOri(ori)
  
  local ax2=mainSf:getGroup('TopRotor')
  ori:set(0, 0, 1, -1, 0, 0, 0, -1, 0)  --group has non id main item
  ori:mulRotateAB(-angle, 0, 1, 0)
  ax2:setOri(ori)
  
  local ax3=mainSf:getGroup('TailRotor')
  ori:setRotate(angle, 1, 0, 0)
  ax3:setOri(ori)

end

register()

I also corrected for the non id placements. The next version won't need the workaround anymore.