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--- tutorials:light-modeling-introduction [2025/01/13 21:18] – added reference MH
+++ tutorials:light-modeling-introduction [2025/06/02 19:58] (current) – MH
@@ Line 1: / Line 1: @@
 ===== General Introduction =====
+==== Rendering vs Light Modelling ====
+**Rendering** is the process of generating a (final) image (or a series of images) from a 3D scene. This includes computing how surfaces appear based on materials, lighting, camera position, and other visual effects.
+**Light Modelling** refers to the mathematical and physical simulation of how light behaves in a 3D environment, particularly how it interacts with objects (reflection, refraction, absorption, scattering).
+^ **Feature**  ^ **Rendering**  ^ **Light Modelling**  ^
+| **Goal**  | Create image | Simulate realistic light behaviour |
+| **Focus**  | Visual output | Physical correctness and realism |
+| **Includes** | Shading, camera, rasterization | Reflection, refraction, light transport |
+{{ :tutorials:light3.png?direct&450 |}}
+==== Light Modelling ====
 Light modelling generally involves three aspects:
@@ Line 9: / Line 27: @@
 {{ :tutorials:light1.png?direct&500 |}}
-Whereas the Global illumination model handles the actual light computation, the Light sources are the light-emitting elements, and the Local illumination model defines the optical properties of the scene objects.
+Whereas the **Global illumination** model handles the actual light computation, the **Light sources** are the light-emitting elements, and the **Local illumination** model defines the optical properties of the scene objects.
 In each aspect, computer graphics offers plenty of alternatives.
@@ Line 17: / Line 35: @@
 Several of them are implemented in GroIMP as ready-to-use tools.
-GroIMP integrates two two main **light model implementations**, namely:
+GroIMP integrates two main **light model implementations**, namely:
   * Twilight, a CPU-based implementation
@@ Line 24: / Line 42: @@
 Both implementing different global illumination model for rendering and for light computation.
-{{ :tutorials:light3.png?direct&450 |}}
+More on the different ways to implement a global illumination model can be found here: [[:groimp-platform:raytracing:raytracer_algo|Ray tracer algorithm]]
-In the following, only light computation or light modelling will be discussed.
+The general settings of the can be changed within the GroIPM properties as described in the [[:groimp-platform:raytracing:raytracer_options|Ray tracer options]] section.
+In the following, only light computation or light modelling will be discussed.
-Regarding light sources, GroIMP provides a complete set of possible implementations. They all implement the //Light// and //LightBase// interfaces, which makes them easy to handle and exchange.
+Regarding **light sources**, GroIMP provides a complete set of possible implementations. They all implement the //Light// and //LightBase// interfaces, which makes them easy to handle and exchange.
 {{ :tutorials:light4.png?direct&300 |}}
-For the Local illumination model, which defines the optical properties of the scene objects such as values for absorption, transmission, and reflection, so-called shaders are used.
+For the **Local illumination** model, which defines the optical properties of the scene objects such as values for absorption, transmission, and reflection, so-called shaders are used.
 {{ :tutorials:light5.png?direct&400 |}}