Use of library SVN most adequately for a
development interactive stereoscopic demoscenes.
Everyone demoscene represents a set: a subset of geometric objects, a
subset of light sources, a subset of structures, a subset of cameras. Each
geometric object is set: a subset of vertices (the vertex is defined by the 3D
coordinates and coordinate of texture fitting to it), a subset of surfaces
(surfaces are defined by three vertices) and a material (the material is
characterized by a rate of dispersion and a reflex of light, a texture), a
locating of an object (i.e. its translation, an axis of spin, an angle of spin,
a rate of scaling). Each light source is set: its attitude, orientation (the
vertex in which routes a light source), by type (background, target, dot), a
color (in RGB a format). Each texture represents the rectangular raster file,
the certain sizes (for example, 62*128, 128*256, 256*512). Each camera is set:
The location, target (the vertex in which routes a camera), an angle of sight,
an angle of turn concerning the axis.
Interactive stereoscopic dynamic demoscenes can is extra to contain: the
script, digital characters, dialogues, design. Characters are usually developed
in simulating packets, for example, 3DS MAX, Maya. At use of more modern means
characters can be framed according to 3D scanning's.
As scopes of library of stereovisual components SVN it is possible to
yield: architectural visualization, engineering and scientific visualization,
educational programs and entertaining programs. Objects fashioned in such
programs are better perceived in 3D. They require animations, lively interaction
with the user. As a structure of similar programs it is possible to use
stereoscopic demoscenes, animated models.
For realization 3D applications the applied programming interface should
be used, for example - the Direct3D API. Properties of this API are: it is used in
Windows, the program is written on C, C ++, or C#, use of API by means of calls
from a code. The script 3D applications contains the following: a load of mesh
and textures, for each frame - reading of user input, a calculation of physics,
AI, a frame rendering by means of API calls, a determination of transformation
matrix for meshes, a determination of parameters of drawing, a determination of
parameters of a texture, meshes drawing.
![Esplorer1.jpg]()
Pic. 1 Esplorer1
Program Esplorer v.1.0 is developed for realization of scientific
visualization. The given program is intended for dynamic visualization of
geometric models of building constructions (in particular geodetic domes),
titles of building constructions, with realization of a stereomode of a viewing.
The program works in fullscreen mode. For a viewing of a geometric models in a
stereo it is necessary is extra to have a videocard of firm NVidea, to set the
driver of a videocard and, fitting to it, the stereodriver. For
stereovisualization it is possible to use method PageFlipping (with glasses of
firm Edimensional), or a method anagliph (with glasses Red Cyan).
There are properties: road2 - a surface of an earth, road0 - a
surface of road, road1 - a surface of an earth, house1 - the first dwelling,
house2 - the second dwelling, obj - a geometric model of a building
construction, word - a title of a construction.
![Esplorer2.jpg]()
Pic.1 Esplorer 2
The graphic library of stereo-visual components SVN is applied to a development
of stereoscopic interfaces in interactive demo scenes for architectural
visualization and in stereoscopic dynamic applications for scientific
visualization.
Example of the program Esplorer v.1.0
Application can become stereo-viewer, only after addition all auxillary classes.
Also it loads all components which are required such as road, house, obj, word.
The declaration of class is resulted futher:
using
System;
using
System.Drawing;
using
System.Collections;
using
System.ComponentModel;
using
System.Windows.Forms;
using
System.Data;
using
Microsoft.DirectX;
using
D3D=Microsoft.DirectX.Direct3D;
using
Microsoft.DirectX.DirectInput;
namespace Code136
// Esplorer
{
public struct
Position
{ public
float x;
public float y;
public
float z;
}
public struct
Size
{
public
float width;
public
float height;
public
float depth;
}
public struct
Orientation
{
public
float x;
public
float y;
public
float z;
public float angle;
}
public class Form1 :
System.Windows.Forms.Form
{
private bool running = true;
private D3D.Device device=null;
private Device deviceM=null;
public const
int ScreenWidth = 800;
public const int ScreenHeight = 600;
public Road road0, road1, road2;
public House house1, house2;
public MyObject obj;
public MyWord word;
public Arrow arr1;
public float Nz,Nx,Ny,Mz,My,Mx;
public float sX;
public float sY;
public float sZ;
public float Xold=0.0f;
public float Yold=0.0f;
public float Zold=0.0f;
public float sXold;
public float sYold;
public float sZold;
public float scale1;
string msg;
private float x1=2.0f;
private float y1=2.0f;
private float z1=2.0f;
private float x2=2.0f;
private float y2=2.0f;
private float z2=2.0f;
private Position pos1;
private Size size1;
private Orientation orient1;
public float angle =
0.0f;
private D3D.Mesh mesh =
null;
private D3D.Material[] meshMaterials;
private D3D.Texture[] meshTextures;
public string StatStr;
public AlfabitEn AlfE;
public Size SLetter;
This form contains the following components:
- Road road1 the auxiliary object representing earth surface,
- Road road0 the auxiliary object representing road surface,
- Road road2 the auxiliary object representing earth surface,
- House house1 the auxiliary object representing civil building,
- House house2 the auxiliary object representing civil building,
- MyObject obj the basic object representing geometrical model of architectural object,
- MyWord word the auxiliary object representing name of basic object.
Application Explorer the constructor
The constructor of the given class looks so:
public
Form1()
{
InitializeComponent();
this.SetStyle(ControlStyles.AllPaintingInWmPaint|ControlStyles.Opaque,true);
this.KeyDown+=new
KeyEventHandler(OnKeyDown);
this.MouseUp+=new
MouseEventHandler(OnMouseUp);
this.MouseDown+=new
MouseEventHandler(OnMouseDown);
SLetter =new
Size();
SLetter.width=1.0f; SLetter.depth=1.0f; SLetter.height=1.5f;
}
Loading components
The interface for our program stereo-viewer will consist of several components.
They contain in the form and include the models of road, earth, building,
architectural object. They allow the user to see dynamic stereoscopic virtual
scene with architectural object. Component are loaded by separate methods causes
InitializeGraphics() method, which is used to load in stereo-viewer a full set
of components and establish width, height, and depth of the scene.
public
void
InitializeGraphics()
{
string
tmp;
D3D.PresentParameters
presentParams=new
D3D.PresentParameters();
presentParams.SwapEffect =
D3D.SwapEffect.Discard;
D3D.Format
current = D3D.Manager.Adapters[0].CurrentDisplayMode.Format;
if
(D3D.Manager.CheckDeviceType(0,
D3D.DeviceType.Hardware,
current, current, false))
{
presentParams.Windowed =
false;
presentParams.BackBufferFormat =
current;
presentParams.BackBufferCount = 1;
presentParams.BackBufferWidth =
ScreenWidth;
presentParams.BackBufferHeight =
ScreenHeight;
presentParams.AutoDepthStencilFormat
= D3D.DepthFormat.D16;
presentParams.EnableAutoDepthStencil
= true;
}
else
{
presentParams.Windowed =
true;
presentParams.AutoDepthStencilFormat
= D3D.DepthFormat.D16;
presentParams.EnableAutoDepthStencil
= true;
}
device=
new
D3D.Device(0,D3D.DeviceType.Hardware,
this,
D3D.CreateFlags.SoftwareVertexProcessing,presentParams);
AlfE=
new AlfabitEn(device);
pos1=
new
Position();
Position
pos2= new
Position();
orient1=
new
Orientation();
Orientation orient2=
new
Orientation();
size1=
new Size();
pos2.x=0.0f; pos2.y=20.0f; pos2.z=0.0f;
orient2.x=1.0f; orient2.y=0.0f; orient2.z=0.0f;
orient2.angle=1.50f;
arr1=
new Arrow(device);
arr1.pos=pos2;
arr1.orient=orient1;
Nz=arr1.pos.z;//0.0f;
Nx=arr1.pos.x;//30.0f;
Ny=arr1.pos.y;//0.0f;
sZ=Nz;
sY=Ny;
sX=Nx;
Mz=-0.81f;
Mx=-0.81f;
My=+0.81f;
pos1.x=16.0f; pos1.y=0.0f; pos1.z=-30.0f;
size1.width=16.0f; size1.height=0.10f; size1.depth=90.0f;
road2 =
new Road(device,pos1, size1,
"cubegg.x","gr256.bmp");
pos1.x = 0.0f; pos1.y = 0.0f; pos1.z = -30.0f;
size1.width = 16.0f; size1.height = 0.1f; size1.depth =
90.0f;
road0 =
new Road(device,pos1, size1,
"cubegr.x","tex0.bmp");
pos1.x = -16.0f; pos1.y = 0.0f; pos1.z = -30.0f;
size1.width = 16.0f; size1.height = 0.1f; size1.depth =
90.0f;
road1 =
new Road(device,pos1, size1,
"cubegg.x","gr256.bmp");
pos1.x = -20.0f; pos1.y = 7.5f; pos1.z = -37.5f;
size1.width = 8.0f; size1.height = 15.0f; size1.depth =
25.0f;
house1 =
new
House(device,pos1, size1,"cubev1.x","tex1256.bmp");
pos1.x = 20.0f; pos1.y = 7.5f; pos1.z = -30.5f;
size1.width = 8.0f; size1.height = 15.0f; size1.depth =
37.5f;
house2 =
new
House(device,pos1, size1,"cubev2.x","tex2256.bmp");
pos1.x = 0.0f; pos1.y = 9.0f; pos1.z = -8.0f;
size1.width = 10.0f; size1.height = 10.0f; size1.depth =
20.0f;
obj =
new MyObject(device, pos1, size1,
""thief.x");
pos1.x = -8.0f; pos1.y =
1.0f; pos1.z = -70.0f;
word =
new MyWord(device,"word","ILINSKAJA
N.NOVGOROD", pos1, orient1, size1, 10, 1,
1.0f, AlfE);
Location=new
Point(0,0);
Cursor.Position=new
Point(Width/2, Height/2);
}
For stereo-mode it is nesessary to activate full - screen mode. It is made in
this method also.
Drawing the stereo viewer
Drawing of the stereo viewer is made in method OnPaint():
protected
override
void
OnPaint(System.Windows.Forms.PaintEventArgs e)
{
device.Clear(D3D.ClearFlags.Target|D3D.ClearFlags.ZBuffer,
Color.CornflowerBlue, 1.0f, 0);
SetupCamera();
Graphics g= e.Graphics;
device.BeginScene();
arr1.pos.x=sX;
arr1.pos.y=sY;
arr1.pos.z=sZ;
arr1.Draw(device);
road2.Draw(0.0f,0.0f,0.0f,road2.pos,road2.size);
road1.Draw(0.0f,0.0f,0.0f,road1.pos,road1.size);
road0.Draw(0.0f,0.0f,0.0f,road0.pos,road0.size);
house1.Draw(0.0f, 0.0f, 0.0f, house1.pos, house1.size);
house2.Draw(0.0f, 0.0f, 0.0f, house2.pos, house2.size);
obj.Draw(
ref
angle, angle / (float)Math.PI,
0.0f,0.0f, obj.pos, obj.size);
word.Draw(device, word.pos, word.orient, word.size,
"ILINSKAJA N.NOVGOROD");
g.DrawString(StatStr,
new
Font("Times
New Roman", 12),
new
SolidBrush(Color.Black), 0, 0);
device.EndScene();
device.Present();
UpdateInputState();
this.Invalidate();
}
Clearing
Clearing of resources is made by method Dispose() :
protected
override
void
Dispose( bool
disposing )
{
if(
disposing )
{
}
base.Dispose(
disposing );
}
Conclusion
In this article it is submitted the program of stereo-viewer. The application of
stereo-viewer, however, can be advanced. Now, it does not support open of files
with geometric models, move camera, among other functionalities. This elements
could be added.