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--- tutorials:basic-spectral-light-modeling [2025/06/04 13:39] – MH
+++ tutorials:basic-spectral-light-modeling [2025/06/04 14:08] (current) – MH
@@ Line 378: / Line 378: @@
-==== Sensor nodes ====
-To monitor light distributions with a scene without interfering, GroIMP provides the //SensorNode// class, a sphere that can be placed arbitrarily within the scene. To obtain the sensed spectrum, the //getSensedIrradianceMeasurement()// function needs to be called.
-Note: The size of the sensor node directly correlates with the probability of got hit by a light ray. For a very small sphere the probability to got hit by a light ray is relatively low, so the number of light rays simulated by the light model needs to be much larger to get repayable results. Therefore, better not to use very small sensor nodes.
-Note: The colour of the sensor node determines which wavelengths should be observed. The default value is white, what stands for monitor all colours. If, for instance, the sensor colour is set to red, only red spectra will be sensed.
-Note: The output of a sensor node is normalized to absorbed radiance per square meter, independent of the actual size of the sensor.
-Note: Sensor nodes can be enabled and disabled for the light model using the LM.setEnableSensors(true/false) function. By default they are disabled, since GroIMP version 2.1.4, before they were enabled by default. Having them disabled speeds up the light computation time for scenarios where not sensor nodes are involved.
-<code java>
-// create a 5cm, white sensor node
-Axiom ==> SensorNode().(setRadius(0.05), setColor(1, 1, 1));
-//check what the sensor node has sensed
-x:SensorNode ::> {
-    Measurement spectrum = lm.getSensedIrradianceMeasurement(x);
-    float absorbedPower = spectrum.integrate();
-    ...
-}
-</code>