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--- tutorials:use_fluxmodel [2024/04/29 14:27] – created gaetan
+++ tutorials:use_fluxmodel [2024/04/29 14:39] (current) – gaetan
@@ Line 1: / Line 1: @@
 In this tutorial we will see how to get started with a FluxModel in GroIMP.
+Go [[:groimp-platform:gpuflux|here]] to see more about how the FluxModel is defined in GroIMP.
 ====== Light Model ======
@@ Line 110: / Line 112: @@
 </code>
+This is :
+  - importing the required classes
+  - defining of the physical light distribution
+  - defining of the spectral power distribution
+  - defining of a lamp using the specified parameters
+The light distribution and spectral distribution (i.e. the ''DISTRIBUTION'', ''WAVELENGTHS'' and ''AMPLITUDES'' arrays) can also be provided from ''.ies'' files.
+See [[:groimp-platform:input-and-output-in-groimp|here]] for more information on the supported file formats.
+Then, let's create a parameterizable light node – using file references for physical and spectral power distribution.
+<code java>
+const LightDistributionRef DISTRIBUTION = light("
+distribution1");
+const SpectrumRef SPECTRUM = spectrum("equal");
+module MyLamp1 extends LightNode {
+{
+setLight(new SpectralLight(new PhysicalLight(
+DISTRIBUTION), SPECTRUM, 10)); // 10 W
+}
+}
+module MyLamp2 extends LightNode {
+{
+setLight(
+new SpectralLight().(
+setPower(10), //[W]
+setLight(new PhysicalLight(DISTRIBUTION)),
+setSpectrum(SPECTRUM)));
+}
+}
+</code>
+This is:
+  - Defining a file reference. This file can be included or linked to a project
+  - Applying a concrete lamp to the reference by:
+    - using the constructor
+    - using the set-methods of the //LightNode// class
+====== Illumination Model ======
+Definition of a Phong shader by textures, by colours and by a user-defined
+spectral power distribution.
+<code java>
+Phong myShader = new Phong();
+ImageMap image = new ImageMap();
+image.setImageAdapter(new FixedImageAdapter(image("leaf").toImageAdapter().getBufferedImage()));
+myShader.setDiffuse(image);
+Phong myShader = new Phong();
+myShader.setDiffuse(new RGBColor(0,1,0));
+//myShader.setSpecular(new Graytone(0.5));
+//myShader.setShininess(new Graytone(0.5));
+myShader.setDiffuseTransparency(new RGBColor(0.5,0,0));
+//myShader.setAmbient(new Graytone(0.5));
+//myShader.setEmissive(new Graytone(0.5));
+ChannelSPD MySPD = new ChannelSPD(new IrregularSpectralCurve(
+    new float[] {400,410, ....,740,750}, //WAVELENGTHS
+    new float[] {0.1,0, .... ,0.4,0.25} //AMPLITUDES
+));
+Phong myShader = new Phong();
+myShader.setDiffuse(MySPD);
+</code>
+This is:
+  - Setting an image as texture: Values for reflection depend on the colour of the texture at each pixel of the image.
+  - Setting specific properties: At this configuration green will be reflected to 100 % and red will be transmitted to 50 % for the whole surface of the object.
+  - A user-defined SPD is used to define the diffuse colour.