Added subchapter about iridescence effect

buddhi1980 · Oct 28, 2020 · 64e7f80 · 64e7f80
1 parent 2f46846
commit 64e7f80
Show file tree

Hide file tree

Showing 8 changed files with 40 additions and 0 deletions.
diff --git a/img/manual/media/material_iridescence.png b/img/manual/media/material_iridescence.png
diff --git a/img/manual/media/material_iridescence_intensity_1.png b/img/manual/media/material_iridescence_intensity_1.png
diff --git a/img/manual/media/material_iridescence_intensity_2.png b/img/manual/media/material_iridescence_intensity_2.png
diff --git a/img/manual/media/material_iridescence_intensity_4.png b/img/manual/media/material_iridescence_intensity_4.png
diff --git a/img/manual/media/material_iridescence_thickness_05.png b/img/manual/media/material_iridescence_thickness_05.png
diff --git a/img/manual/media/material_iridescence_thickness_1.png b/img/manual/media/material_iridescence_thickness_1.png
diff --git a/img/manual/media/material_iridescence_thickness_2.png b/img/manual/media/material_iridescence_thickness_2.png
diff --git a/mandelbulber2/manual/chapters/materials.tex b/mandelbulber2/manual/chapters/materials.tex
@@ -347,6 +347,46 @@ \subsection{Rough surface}\label{materials-roughness}
 {roughness = 0.1}
 {material-surface-roughness-01}
 
+\subsection{Iridescence}\label{materials-iridescence}
+
+\emph{Iridescence} effect creates gradual change color as the angle of view or the angle of illumination changes. In nature this phenomenon is visible on soap bubbles or on seashell nacre. 
+Iridescence in visible on specular highlights, glossy or transparent surfaces. 
+
+ \simpleImageWithCaptionThirdWidth{img/manual/media/material_iridescence.png}
+ {Example of iridescence effect}
+ {material-iridescence-example}{H}
+
+In most of cases default parameters of iridescence effect gives satisfactory results, but there are two parameters which control this effect.
+
+\begin{description}
+	\item[Intensity] controls visibility of iridescence effect
+
+	\threeImagesWithTwoCaptionsFullWidth
+	{img/manual/media/material_iridescence_intensity_1.png}
+	{iridescence intensity = 1}
+	{material-iridescence-intensity-1}
+	{img/manual/media/material_iridescence_intensity_2.png}
+	{iridescence intensity = 2}
+	{material-iridescence-intensity-2}
+	{img/manual/media/material_iridescence_intensity_4.png}
+	{iridescence intensity = 4}
+	{material-iridescence-intensity-4}
+
+	\item[Subsurface relative thickness] controls simulated thickness of layer where iridescence is created. Higher value causes more frequent color changes but effect is weaker.
+
+	\threeImagesWithTwoCaptionsFullWidth
+	{img/manual/media/material_iridescence_thickness_05.png}
+	{Subsurface relative thickness = 0.5}
+	{material-iridescence-thickness-05}
+	{img/manual/media/material_iridescence_thickness_1.png}
+	{Subsurface relative thickness = 1}
+	{material-iridescence-thickness-1}
+	{img/manual/media/material_iridescence_thickness_2.png}
+	{Subsurface relative thickness = 2}
+	{material-iridescence-thickness-2}
+
+\end{description}
+
 \subsection{Luminosity}\label{materials-luminosity}
 
 \emph{Luminosity} property makes the surface bright even when the object is not illuminated by any light source. When \emph{Monte Carlo algorithm} and \emph{Calculate MC global illumination} are enabled, objects with high luminosity can illuminate other objects in the scene.