docs/hierarchy.md

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+# Hierarchy
+
+![](../docs/images/hierarchy.png) 
+**the image will be changed**
+
+### Vision
+
+* function `getProperty(name: Name, inherit: Boolean, includeStyles: Boolean, includeDefaults: Boolean)`. 
+
+It gets properties of element with `name` identification.
+`inherit` — toggles parent node property lookup. Null means inference from descriptor. Default is false.
+`includeStyles` — toggles inclusion of. Null means inference from descriptor. Default is true. 
+`includeDefaults` — default is false.
+
+* function `setProperty(name: Name, item: MetaItem?, notify: Boolean = true)`
+
+Sets the `item` property to the element with the `name` identification. `notify` is a value which toggles the necessity of the change notification. Default is true.

docs/inheritance

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+## Inheritance
+
+Inheritance is an ability of an element to transfer a pack of properties to its `children` elements 'wrapped inside'.
+
+Properties have to be set in a specific order:
+### Main properties' inheritance:
+* styles
+* parents
+* parent's styles
+* defaults
+
+As for `prototypes`, this property has to be set after styles, but before parents. So the order will be this:
+### Reference properties' inheritance:
+* styles
+* prototypes
+* parents
+* parent's styles
+* defaults
+------------------------
+Let's take a closer look using a [Muon Monitor Visualization](demo/muon-monitor/README.md).
+Running the demo, we will see this:
+
+![](../docs/images/inheritance-1.png)
+
+You can see a tree of elements on the left; 'World' is a `root`, 'bottom', 'middle', and 'top' are 'World's `children` and so on.
+
+![](../docs/images/inheritance-tree.png)
+
+On the right, there is a list with changeable properties.
+
+![](../docs/images/inheritance-properties.png)
+
+Properties, which can or cannot be inherited, are these:
+* `visible` - toggles the visibility of an element. To be exact, the invisibility of an element is inheritable.
+  If a `parent` element is invisible, other elements are invisible as well, and they cannot be changed to visible mode.
+  ![](../docs/images/inheritance-2-1-1.png)
+  ![](../docs/images/inheritance-2-1-2.png)
+
+* `material` - a group of properties, which can be inherited and which can be changed in `children` elements.
+    * `color` - color of an element.
+    * `opacity` - a number from 0 to 1 which represents percents of opacity (0 for 0%, 1 for 100%).
+    * `wireframe` - toggles the wireframe mode.
+
+  Let's see how elements of the `material` group inherit changing `color` property; ***other properties of this group inherit in the same way.***
+
+  Let's change color of 'World' element:
+  ![](../docs/images/inheritance-2-2-1.png)
+  It is a `parent`, so 'bottom', 'middle', and 'top' elements inherit this color.
+
+  Now, let's change 'top's color:
+  ![](../docs/images/inheritance-2-2-2.png)
+  It changes only, 'bottom' and 'middle' stays the same.
+
+  'top' is a `parent` element as well: it has `children` - 'SC72', 'SC73', ... ,'SC80'.
+  Let's change the color of 'SC76':
+  ![](../docs/images/inheritance-2-2-3.png)
+  Again, only 'SC76' has changed among other 'siblings'.
+
+  However, 'SC76' is a `parent` too. Let's change one of its `children` color (here we change 'SC76_5's color'):
+  ![](../docs/images/inheritance-2-2-4.png)
+
+  As we can see, `color` is inheritable property, which can be changed in a custom way.
+
+  If after all those changes we set at the 'World' element grey color, changes won't disappear:
+  ![](../docs/images/inheritance-2-2-5.png)
+
+* `rotation` - rotation of an element. Here, it is set by `x` value. It is inheritable and unable to be changed in `children` elements.
+* `position` - position of an element, cannot be inherited.

docs/uml/Vision.puml

@@ -1,45 +1,108 @@
 @startuml
 'https://plantuml.com/class-diagram
+interface Vision
 
-interface Vision{
-    val parent: Vision?
-    fun getProperty(name): Meta?
-    fun setProperty(name, value)
-}
 
-class VisionBase{
+interface Solid
-    basic vision
+Vision <- Solid
-    implementation
-}
-Vision <|-- VisionBase
 
-interface VisionGroup{
-    A group of Visions
-}
-Vision <|-- VisionGroup
 
-interface Solid{
+class VisionGroup
-    The base for 3D geometry
+Vision <-- VisionGroup
-}
 
-Vision <|-- Solid
+class VisionBase
+Vision <- VisionBase
+
+
+class SolidLabel
+Solid <--- SolidLabel
+SolidBase <-- SolidLabel
 
 class SolidGroup
+Solid <--- SolidGroup
+VisionGroupBase <-- SolidGroup
 
-Solid <|-- SolidGroup
+class SolidBase
-VisionGroup <|-- SolidGroup
+Solid <--- SolidBase
+VisionBase <-- SolidBase
 
-class Composite
-Solid <|-- Composite
-VisionGroup <|-- Composite
 
-class Box
+class SphereLayer
-Solid <|-- Box
+SolidBase <-- SphereLayer
-
+GeometrySolid <-- SphereLayer
-class Tube
-Solid <|-- Tube
 
 class Sphere
-Solid <|-- Sphere
+SolidBase <-- Sphere
+GeometrySolid <-- Sphere
 
+class Box
+SolidBase <-- Box
+Hexagon <-- Box
+
+class GenericHexagon
+SolidBase <-- GenericHexagon
+Hexagon <-- GenericHexagon
+
+class Extruded
+SolidBase <-- Extruded
+GeometrySolid <-- Extruded
+
+
+class PolyLine
+Solid <--- PolyLine
+SolidBase <-- PolyLine
+
+interface GeometrySolid
+Solid <--- GeometrySolid
+
+
+interface Hexagon
+GeometrySolid <-- Hexagon
+
+class ConeSegment
+GeometrySolid <-- ConeSegment
+
+class ConeSurface
+GeometrySolid <-- ConeSurface
+
+
+class Convex
+Solid <--- Convex
+SolidBase <-- Convex
+
+class Composite
+Solid <--- Composite
+SolidBase <-- Composite
+
+
+interface SolidReference
+VisionGroup <---- SolidReference
+
+interface MutableVisionGroup
+VisionGroup <---- MutableVisionGroup
+
+class SolidReferenceGroup
+VisionGroup <-- SolidReferenceGroup
+Solid <-- SolidReferenceGroup
+VisionBase <-- SolidReferenceGroup
+SolidReference <-- SolidReferenceGroup
+
+class ReferenceChild
+VisionGroup <-- ReferenceChild
+Solid <-- ReferenceChild
+SolidReference <-- ReferenceChild
+
+
+class VisionGroupBase
+VisionBase <-- VisionGroupBase
+MutableVisionGroup <-- VisionGroupBase
+
+
+
+class RootVisionGroup
+VisionGroupBase <-- RootVisionGroup
+
+
+class VisionOfPlotly
+VisionBase <-- VisionOfPlotly
 @enduml