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tutorials:spectral-light-modeling-architecture [2025/05/28 16:38] – barley1965tutorials:spectral-light-modeling-architecture [2025/06/01 17:45] (current) – barley1965
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 You can see in the commented block that we have already used several lamps. You can do the same: change the composition of lamps as you like, save the code file, and then on //Render View// -> //Flux renderer//, to see the color combination.  You can see in the commented block that we have already used several lamps. You can do the same: change the composition of lamps as you like, save the code file, and then on //Render View// -> //Flux renderer//, to see the color combination. 
  
-{{:tutorials:spectralight.png}}+{{:tutorials:spectrallight.png}}
  
 You may then click on the ''Run grow'' button to see some output: First of all, you note that there are several charts: Leaf surface dynamics (to monitor the leaf surface of each leaf rank), then Internode length dynamics (for each internode rank), Red/Far red ratio, Phytochrome ratio, and Absorbed spectrum. Starting with the last item, Absorbed spectrum actually gives out the light absorbed per leaf rank, but for each “bucket” of about 2.6 nm wavelength, so you can see how much blue, green, red and far red light each leaf is actually absorbing (we can only guess how much of this is transmitted and reflected but all of this must add up to 100%...). How does this work? Have a look at the definition of the ''Leaf'' (''Modules.rgg'', L. 82ff):  You may then click on the ''Run grow'' button to see some output: First of all, you note that there are several charts: Leaf surface dynamics (to monitor the leaf surface of each leaf rank), then Internode length dynamics (for each internode rank), Red/Far red ratio, Phytochrome ratio, and Absorbed spectrum. Starting with the last item, Absorbed spectrum actually gives out the light absorbed per leaf rank, but for each “bucket” of about 2.6 nm wavelength, so you can see how much blue, green, red and far red light each leaf is actually absorbing (we can only guess how much of this is transmitted and reflected but all of this must add up to 100%...). How does this work? Have a look at the definition of the ''Leaf'' (''Modules.rgg'', L. 82ff): 
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 </code> </code>
  
-//Tasks: +Tasks: 
 1) Run the model with different lamp configurations! Observe the effect on internode length and leaf surface dynamics! 1) Run the model with different lamp configurations! Observe the effect on internode length and leaf surface dynamics!
 +
 2) Run the model for a number of steps, then move a lamp<sup>*</sup>, or change its power output! You can also add a Sky light source but beware that this has a dramatic effect on the R/FR ratio (hint! To prevent this, you have to increase the power output of the two far red lamps as it currently is too low). Once you have added a Sky light, you can also have a look at the Photosynthesis rate dynamics (for some reason, the light output of the LED lamps alone is a bit too low).  2) Run the model for a number of steps, then move a lamp<sup>*</sup>, or change its power output! You can also add a Sky light source but beware that this has a dramatic effect on the R/FR ratio (hint! To prevent this, you have to increase the power output of the two far red lamps as it currently is too low). Once you have added a Sky light, you can also have a look at the Photosynthesis rate dynamics (for some reason, the light output of the LED lamps alone is a bit too low). 
-3) Open the Excel file Spectre.xlsx and inspect the way the relation between absorbed blue and rfr and slope/maximum dimension has been implemented!  + 
-4) Currently we have only one plant in the scene: go to Parameters.rgg, L. 45, 46 and 49 and modify the parameters so that you get 25 plants (5 x 5), with plant number 13 being the chosen one! Then run the model again to see if the plants will develop differently!// +3) Open the Excel file {{tutorials:spectre.xlsx|Spectre.xlsx}} and inspect the way the relation between absorbed blue and rfr and slope/maximum dimension has been implemented!  
 + 
 +4) Currently we have only one plant in the scene: go to Parameters.rgg, L. 45, 46 and 49 and modify the parameters so that you get 25 plants (5 x 5), with plant number 13 being the chosen one! Then run the model again to see if the plants will develop differently! 
  
 ''<sup>*</sup>To move a lamp, you can click on its tip and then drag the lamp into one direction (x, y z) by clicking, holding and moving one of the three arrowheads. If selection in the scene doesn’t work you can try finding the lamp using the Flat Object Inspector window that is already open in your model:''  ''<sup>*</sup>To move a lamp, you can click on its tip and then drag the lamp into one direction (x, y z) by clicking, holding and moving one of the three arrowheads. If selection in the scene doesn’t work you can try finding the lamp using the Flat Object Inspector window that is already open in your model:'' 
      
  
tutorials/spectral-light-modeling-architecture.1748443115.txt.gz · Last modified: 2025/05/28 16:38 by barley1965