CREATING AN AVATAR
At previous lesson we talked about the "positional point" for the instalation of a "piece". But for some pieces we are introducing now a new concept to be used : the basecentral point.It will be used for pieces that can be in movement or have a cylindric form.
The avatar will be this kind of piece.
Another new thing: this piece has two AxisAngleRotation3D ! Normally we only will change the second for instalation. But we will use both to code the movements.
The definition of the piece is:
<MaterialGroup x:Key="charac1M">
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<ImageBrush ImageSource="charac1.png" TileMode="None" ViewportUnits="Absolute" Viewport="0 0 1 1" AlignmentX="Left" AlignmentY="Top" Opacity="1.000000" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="29.8667">
<SpecularMaterial.Brush>
<SolidColorBrush Color="White" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
</MaterialGroup>
<Transform3DGroup x:Key="charac1T">
<ScaleTransform3D ScaleX="0.1" ScaleY="0.1" ScaleZ="0.1" />
<RotateTransform3D>
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="90" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<RotateTransform3D>
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="-90" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<TranslateTransform3D OffsetX="0" OffsetY="1.5" OffsetZ="0" />
</Transform3DGroup>
<MeshGeometry3D x:Key="charac1G"
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/>
The texture of the piece, that can be changed, like we did for the demo, (remember to recompile), is included in the download. Important to note that it is inverted and deformed:
An avatar is an object, a piece some like others that has "cardinality". The main difference is that the avatar will change his "cardinality" dinamicaly.
An avatar will turn to and move ahead in the South direction when "k" is pressed. North for "i". West for "j". East for "l".
The Transform (position + orientation) of a 3D piece is defined by a matrix having 16 elements. The elements 13, 14 and 15 are the X, Y and Z positions of the piece. To move a piece we will use these points like you can analise in the downloadable code.
A Quaternion represents a rotation in the space of 3 dimensions. It's defined by an axis of rotation and an angle. To aply the rotation we need to define a "point of rotation".
For the movement to South, we define for the "k" key pressed:
...
if (e.Key == Key.K ){
TheZ=TheZ+1;
trans = new Matrix3D(0.1,0,0,0,0,0.1,0,0,0,0,0.1,0,TheX ,TheY,TheZ,1);
Quaternion qt = new Quaternion(new Vector3D(1, 0, 0),90);
Point3D pt = new Point3D(TheX , TheY,TheZ);
trans.RotateAt(qt,pt);
qt = new Quaternion(new Vector3D(0, 1, 0),180);
trans.RotateAt(qt,pt);
mtrans= new MatrixTransform3D(trans);
ModelVisual3D mv3D = VP.Children[0] as ModelVisual3D;
Model3DGroup m3Dg = mv3D.Content as Model3DGroup;
m3Dg.Children[4].Transform= mtrans ;
}
...
Important to note that we have defined some variables:
... Double TheZ = 0; Double TheX = 0; Double TheY=1.5; Matrix3D trans; MatrixTransform3D mtrans; ...
You can see in the demo that the avatar moves OK (remember: the keys are "i", "k", "j", "l") but it's crossing the wall like a ghost! We will talk about collision detection in the next lesson.
To look the source codes and/or run the exercice, create a folder having the name of the .ZIP file and download it - right-clicking the link - and unzip inside the folder :
Try to recreate the exercice changing the code or some texture (try the "medieval man" you see at this page, by example).
Liberate the firewall and play this web3d application:
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We are doing our tests at a: Notebook DELL Latitude D600 - Intel Pentium M755 2.0 GHZ - Memory: 512 MB - VideoCard ATI Radeon 9000 32MB DDR 4xAGP - Resolution 1400x1050 - Communication: ADSL 256 kbps (Download: 45 kBps, Upload: 14 kBps)
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