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+# Tutorial
+
+#### The main goal of this tutorial is to show main capabilities of the visualization instrument.
+
+The simple visualization can be made with function `main`. (this part will be supplemented)
+```kotlin
+import kotlinx.html.div
+import space.kscience.dataforge.context.Context
+import space.kscience.visionforge.html.ResourceLocation
+import space.kscience.visionforge.solid.*
+import java.nio.file.Paths
+
+fun main(){
+    val context = Context{
+        plugin(Solids)
+    }
+
+    context.makeVisionFile (
+        Paths.get("nameFile.html"),
+        resourceLocation = ResourceLocation.EMBED
+    ){
+        div {
+           //first vision
+            vision {
+                solid {
+                    //solids which you want to visualize
+                }
+            }
+           //second vision
+           vision {
+              solid {
+                 //solids which you want to visualize
+              }
+           }
+        }
+    }
+}
+```
+## Solids properties
+**We will analyze which basic properties solids have using `box` solid.**
+
+*Basic properties:*
+1. `opacity` - It is set in `float`. It takes on values from 0 to 1, which represent percents of solid opacity. It's initial value is 1.
+2. `color` - It can be specified as `Int`, `String`, or as three `Ubytes`, which represent color in `rgb`. Elementally, the solid will have `green` color.
+3. `rotation` - it's the point, which set rotations along axes. Initially, the value is `Point3D(0, 0, 0)`. Changing `x` coordinate of the point, you make pivot around `x axis`. The same for other coordinates: changing `y` - pivot around `y axis`, changing `z` - pivot around `z axis`.
+4. position, which is given by values `x`, `y`, `z`. Initial values are `x = 0`, `y = 0`, `z = 0`. The coordinate system is Cartesian. It's elemental position is this - vertical `y` axis and horizontal `Oxz` plane.
+
+Let's see how properties are set in solids.
+The `small box` will have elemental values of properties. If you don't set properties, it will have the same `position`, `color`, `rotation`, and `opacity` values.
+
+***You can see that `box` take four values. Later, we will discuss what they do in more detail. Now, it does not really matter.***
+```kotlin
+box(10, 10, 10, name = "small box"){
+   x = 0
+   y = 0
+   z = 0
+   opacity = 1 //100% opacity
+   color("red") //as string
+   rotation = Point3D(0, 0, 0)
+}
+```
+![](../docs/images/small-box.png)
+
+The `big box` will have properties with custom values. 
+```kotlin
+box(40, 40, 40, name = "big box"){
+   x = 20
+   y = 10
+   z = 60
+   opacity = 0.5 //50% opacity
+   color(0u, 179u, 179u) //color in rgb
+   rotation = Point3D(60, 80, 0)
+}
+```
+![](../docs/images/big-rotated-box.png)
+If we compare these boxes, we will see all differences. 
+
+Here is the function `main` with both boxes.
+```kotlin
+fun main(){
+    val context = Context{
+        plugin(Solids)
+    }
+
+    context.makeVisionFile (
+        Paths.get("customFile.html"),
+        resourceLocation = ResourceLocation.EMBED
+    ){
+        div {
+            vision {
+                solid {
+                   box(10, 10, 10, name = "small box"){
+                      x = 0
+                      y = 0
+                      z = 0
+                      opacity = 1 //100% opacity
+                      color("red") //as string
+                      rotation = Point3D(0, 0, 0)
+                   }
+                   box(40, 40, 40, name = "big box"){
+                      x = 20
+                      y = 10
+                      z = 60
+                      opacity = 0.5 //50% opacity
+                      color(0u, 179u, 179u) //rgb
+                      rotation = Point3D(60, 80, 0)
+                   }
+                }
+            }
+        }
+    }
+}
+```
+![](../docs/images/two-boxes-1.png)
+![](../docs/images/two-boxes-2.png)
+
+***There is plenty of other properties, especially of those, which you can create by yourself. Here we mention just small part.***
+
+## Basic Solids
+Now, let's see which solids can be visualized:
+### 1) PolyLine
+
+It's scarcely a solid, but it can be visualized, so we mention it. 
+`polyline` build lines, obviously. Let's take a look at it's work.
+
+`polyline` requires two values - `points`, and `name`:
+* `points` is a `vararg` with `Point3D` type. It takes pairs of points, which you want to connect.
+* `name` is an identifier of *any solid*, but in this case it is an identifier of `polyline`.
+It's type is `String`. **This value can be required by any solid;
+you can set it, you can not to set it, but without you won't be able to control solid, since it won't be inherited.**
+
+This is an example of polyline with other solid `box`:
+```kotlin
+box(100, 100, 100, name = "box"){
+   x = -10
+   y = -10
+   z = -10
+   opacity = 0.4
+}
+polyline(Point3D(30, 20, 10), Point3D(30, -100, 30), Point3D(30, -100, 30), Point3D(50, -100, 30), name = "polyline"){
+   color("red")
+}
+```
+
+![](../docs/images/polyline-points.png)
+![](../docs/images/polyline-points-2.png)
+
+### 2) Box
+
+First thing which has to be mentioned is that `box` takes four values: `box(x, y, z, name)`
+* `x` - x-axis length of the `box`
+* `y` - y-axis length of the `box`
+* `z` - z-axis length of the `box`
+
+These values have `Float` type. 
+
+*`x`, `y`, and `z` are necessary values, which cannot be ignored. You have to set them.*
+
+* `name` - `box`'es identifier. You've already met it. 
+
+Let's create just usual `box` with equal ribs.
+
+```kotlin
+   box(50, 50, 50, name = "box") {
+        color("pink")
+   }
+```
+   ![](../docs/images/box.png)
+
+Now, let's make `box` with bigger `y` value.
+   ```kotlin
+   box(10, 25, 10, name = "high box") {
+        color("black")
+   }
+   ```
+As you can see, only rib of `y-axis` differs from other ribs.
+
+   ![](../docs/images/high-box.png)
+
+For final trial, let's create `box` with bigger `x` value.
+   
+   ```kotlin
+   box(65, 40, 40, name = "wide box") {
+        x = 0
+        y = 0
+        z = 0
+        color("black")
+   }
+   ```
+Predictably, only `x-axis` rib bigger than other ribs. 
+
+   ![](../docs/images/wide-box.png)
+   
+### 3) Sphere
+
+It takes in two values: `radius`, and `name`. 
+We bring you to mind that `name` is a general value for all solids, so do not wonder, since all solids need their own identifier.
+
+As for `radius`, it has `Float` type, and, as you can guess, it sets radius of the sphere, which will be created.
+   ```kotlin
+   sphere(50, name = "sphere") {
+        x = 0
+        y = 0
+        z = 0
+        opacity = 0.9
+        color("blue")
+   }
+   ```
+   ![](../docs/images/sphere.png)
+
+### 4) Hexagon
+
+It is solid which has six edges. It is set by eight values: `node1`,..., `node8`. They all have `Point3D` type, so they are just points, vertices.
+
+*Six edges are these:* 
+1) Edge with vertices `node1`, `node4`, `node3`, `node2`
+2) Edge with vertices `node1`, `node2`, `node6`, `node5`
+3) Edge with vertices `node2`, `node3`, `node7`, `node6`
+4) Edge with vertices `node4`, `node8`, `node7`, `node3`
+5) Edge with vertices `node1`, `node5`, `node8`, `node4`
+6) Edge with vertices `node8`, `node5`, `node6`, `node7`
+
+![](../docs/images/scheme.png)
+
+As hexagon takes in specific points, we understand that this solid cannot be moved, it fixed in space, and it can't make pivots.
+
+Let's make classic parallelepiped.
+```kotlin
+   hexagon(
+        Point3D(25, 30, 25),
+        Point3D(35, 30, 25),
+        Point3D(35, 30, 15),
+        Point3D(25, 30, 15),
+        Point3D(30, 18, 20),
+        Point3D(40, 18, 20),
+        Point3D(40, 18, 10),
+        Point3D(30, 18, 10),
+        name = "classic hexagon"){
+        color("green")
+   }
+```
+   ![](../docs/images/classic-hexagon.png)
+
+Now, let's make a custom hexagon.
+
+   ```kotlin
+   hexagon(
+        Point3D(5, 30, 5),
+        Point3D(24, 30, 8),
+        Point3D(20, 30, -10),
+        Point3D(5, 30, -7),
+        Point3D(8, 16, 0),
+        Point3D(12, 16, 0),
+        Point3D(10, 16, -5),
+        Point3D(6.5, 12, -3),
+        name = "custom_hexagon"){
+        color("brown")
+   }
+   ```
+   ![](../docs/images/custom-hexagon.png)
+### 3) Cone
+It takes in six values: `bottomRadius`, `height`, `upperRadius`, `startAngle`, `angle`, and `name`. 
+
+Obviously, `bottomRadius` is responsible for radius of a bottom base, and `height` sets height of a cone along the `z-axis`.
+
+As it takes such values as `upperRadius`, `startAngle`, `angle`, `cone` can build not only usual cones, but also cone segments. Initially, `upperRadius` will have `0.0` value, `startAngle` - `0f`, `angle` - `PI2`, so if you don't set them, you'll get just a simple cone. 
+
+Setting `upperRadius`, you make a frustum cone, since it sets a radius of the upper base of a cone. Set `startAngle`, and `angle` let to cut off segments by planes perpendicular to the base. `startAngle` - an angle, starting with which segment will be left, `angle` - an angle of cone, which will be set from `startAngle`. 
+
+Let's build a classic cone:
+```kotlin
+   cone(60, 80, name = "cone") {
+         color("beige")
+   }
+   ```
+   ![](../docs/images/cone-1.png)
+   ![](../docs/images/cone-2.png)
+
+First of all, we have to try to build a frustum cone:
+```kotlin
+cone(60, 80, name = "cone") {
+   color(0u, 40u, 0u)
+}
+```
+![](../docs/images/frustum-cone.png)
+
+Now, we need to make a try to build a cone segment:
+
+```kotlin
+cone(60, 80, angle = PI, name = "cone") {
+   color(0u, 0u, 200u)
+}
+```
+![](../docs/images/cone-segment-1.png)
+![](../docs/images/cone-segment-2.png)
+
+Finally, the segment of frustum cone is left for a try:
+```kotlin
+cone(60, 100, 20, PI*3/4, angle = PI/3, name = "cone") {
+   color(190u, 0u, 0u)
+}
+```
+![](../docs/images/frustum-cone-segment.png)
+
+### 4) Cone Surface
+This solid is set by seven values:`bottomOuterRadius`, `bottomInnerRadius`, `height`, `topOuterRadius`, `topInnerRadius`, `startAngle`, and `angle`.
+
+In addition to `height`, `startAngle`, and `angle`, which work as they work in `cone`, there are some new values.
+`bottomOuterRadius`, and `bottomInnerRadius` set properties of the bottom circle, `topOuterRadius`, `topInnerRadius` - of the upper circle. They have no initial value, so that means they have to be set.
+
+Generally, `cone`, and `coneSurface` buildings work in the same way, it's possible to make `coneSurface`'s fragments as in `cone`
+
+Let's build usual cone surface with almost all properties set:
+```kotlin
+   coneSurface(60, 50, 30, 10, 100, name = "cone surface") {
+        color("red")
+        rotation = Point3D(2, 50, -9)
+   }
+   ```
+![](../docs/images/cone-surface-1.png)
+![](../docs/images/cone-surface-2.png)
+
+Now, let's create a cone surface and set all it's properties:
+
+```kotlin
+coneSurface(30, 25, 10, 10, 8,0f, pi*3/4, name = "cone surface") {
+   color("fuchsia")
+   rotation = Point3D(2, 50, -9)
+}
+```
+![](../docs/images/cone-surface-fragment.png)
+![](../docs/images/cone-surface-fragment-2.png)
+
+### 5) Cylinder
+
+This solid is set by `radius`, and `height`. As you can see by accepting values, there's no option of building fragments of cylinders.
+
+Here's a demonstration of a cylinder:
+
+```kotlin
+cylinder(40, 100, "cylinder"){
+   rotation = Point3D(40, 0, 0)
+   color("indigo")
+}
+```
+![](../docs/images/cylinder-1.png)
+![](../docs/images/cylinder-2.png)
+### 6) Tube
+
+`tube` takes in `radius`, `height`, `innerRadius`, `startAngle`, `angle`, and `name`. *All values are familiar from `cone`, and `coneSurface` solids.*
+
+Here is an example of classic tube:
+```kotlin
+tube(50, 40, 20, name = "usual tube"){
+   opacity = 0.4
+}                    
+```
+![](../docs/images/tube.png)
+
+This is an example of tube fragment:
+
+```kotlin
+tube(50, 40, 20, 0f, PI, name = "fragmented tube"){    
+   color("white")
+}
+```
+![](../docs/images/tube-fragment.png)
+### 7) Extruded
+
+`extruded` is set by two values: `shape`, and `layer`. 
+* `shape` is a value of `List<Point2D>` type. It' s just a list of all points of the solid. *`shape` has to consist of not less than two points!*
+* `layer` is `MutableList` types variable. (here is a sentence with description of the work of this function). *The amount of `layer`-s has to be more than one*
+