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--- workshops:sdau_course [2025/11/12 12:18] – ksmolen
+++ workshops:sdau_course [2025/11/14 11:42] (current) – ksmolen
@@ Line 1: / Line 1: @@
+**Improving leaf shape in the simple tomato model**
+For improved leaf shape, we can define the leaf contour using a mathematical model.
+Below is the implementation of a simplified version; for the full equation, see [[https://doi.org/10.14214/sf.7740|Coussement et al. (2018)]].
+To add the leaf shape function into the model, open the ''simple_tomato_growth_sdau.gsz'' example and copy the code below inside the ''modules_organs.rgg'' file.
+<code java>
+module Leaflet(float length, double width)
+{
+} ==>
+[
+    {
+        int segments = 100;
+    }
+    for (double i=1; i < segments; i++)
+    (
+        {
+            double segmentLength;
+            segmentLength = length/segments;
+            // getNormalizedLeafWidth specifies the half of the shape
+            double segmentWidth = 0.5*width * getNormalizedLeafWidth(1 - i/segments);
+        }
+        Parallelogram(segmentLength, 2*segmentWidth).(setShader(GREEN))
+        RL(60.0/segments)
+    )
+];
+// calculate leaf shape as the normalized width along the midrib,
+// full model: Coussement et al. 2018
+// https://doi.org/10.14214/sf.7740
+static double getNormalizedLeafWidth(float lnorm) {
+    double k1 = 2;
+    double k2 = 2.2;
+    double gL = 0;
+    double maxWidth = 0.6;
+    if (lnorm <= maxWidth) {
+        gL = 1 - Math.pow((maxWidth - lnorm)/maxWidth,k1);
+        } else {
+            gL = 1 - Math.pow((lnorm - maxWidth)/(1 - maxWidth),k2);
+        }
+        return gL;
+    }
+</code>
+Then, inside the definition of ''module Leaf'', replace every occurrence of ''Parallelogram'' by ''Leaflet''.
+Updated model:
+  * {{ :workshops:simple_tomato_growth_niceleaflet_sdau.gsz |}}
 **Modelling with L-systems.**
@@ Line 6: / Line 64: @@
 Model example:
   * {{ :workshops:simple_development_template_sdau.gsz |}}
+  * {{ :workshops:lsystems.gsz |}}
@@ Line 18: / Line 77: @@
   * {{ :workshops:simple_development_rggrules_sdau.gsz |}}
-Simple tomato crop model.
+**Simple tomato crop model.**
 Model example: