csharp
/
XNAGameStudio
зеркало из https://github.com/SimonDarksideJ/XNAGameStudio.git


			
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</head><body><div id="mainSection"><div id="mainBody">

	<h1>Picking Sample</h1>

	This sample shows how to determine whether a player's cursor is over an object, and how to find out where on the screen an object is.
	<a name="ID2EK"></a><h1 class="heading">Sample Overview</h1><div id="ID2EK" class="hxnx1">
		
		<p>
			There are several situations where it can be useful to know the 3D equivalent of a point on the screen,
			and vice versa: for example, checking to see whether a player has clicked on an object, or drawing text above a
			player's head. This can be accomplished by using the <b>Project</b> and <b>Unproject</b> methods on 
      the Viewport class. This sample demonstrates the use of these methods.
		</p>
		<p>
			In the sample, there is a table with several objects on it. If the user moves the cursor over an object,
			the object's name is drawn.
		</p>

		<a name="ID2EX"></a>

		<a name="ID2EDB"></a><h2 class="subHeading">Sample Controls</h2><div id="ID2EDB" class="hxnx2">
			
			<p>This sample uses the following keyboard and gamepad controls.</p>

			<table>
				<tr>
					<th>Action</th>
					<th>Windows Phone</th>
					<th>Windows</th>
					<th>Windows/Xbox Gamepad</th>
				</tr>
        <tr>
          <td>Move the cursor.</td>
          <td><strong>TAP</strong> or <strong>DRAG</strong> screen</td>
          <td>Mouse</td>
          <td>Left thumbstick</td>
        </tr>
				<tr>
					<td>Exit the game.</td>
					<td><strong>BACK</strong></td>
					<td>ESC or ALT+F4</td>
					<td><b>BACK</b></td>
				</tr>				
			</table>
			<p>&nbsp;</p>
		</div>
	</div>

	<a name="ID2EYD"></a><h1 class="heading">How the Sample Works</h1><div id="ID2EYD" class="hxnx1">
		

			<p>
				This sample shows how to determine whether a user's cursor is over an object, and how to
				find out where on the screen an object is. To do this, the sample uses
				<b>Viewport.Project</b> and <b>Unproject</b> to go between screen space and world space. What
				are world and screen space?
			</p>
			<p>
				World space is a simply the coordinate system that your 3D game objects
				live in. When you move a 3D object from (0,0,0) to (0,0,1), you are changing its
				position in world space.
			</p>
			<p>
				Screen space is a coordinate space that closely relates to
				your game's window, and corresponds to pixels. For example, in this sample,
				the screen space goes from (0,0) at the upper left of the game window to
				(853,480) at the lower right of the window. Most 2D games use screen space
				coordinates.
			</p>
			<p>
				The <b>Viewport.Project</b> function takes a world space point and tell you
				where that point will be drawn on the screen. <b>Viewport.Unproject</b> has the
				opposite effect. It takes a screen space point, and returns a point in world space.
			</p>
			<p>
				So, now that you understand what world space and screen space are, and how the <b>Project</b> and
				<b>Unproject</b> functions can convert between them, how can you use that information to tell
				whether the user's cursor is over an object? If the cursor is in 2D screen space, how can
				that "intersect" a 3D world space object?
			</p>
			
			<p>
				To perform that intersection check, the sample uses <b>Viewport.Unproject</b> to convert two
				screen space points into world space. The first point is the cursor's position, with a z-value 
        of zero: as close as possible to the camera. The second point is the same thing but
				with a z-value of one: as far away from the camera as possible. Using those two points,
				you can create a ray, and then check to see whether world space objects intersect that ray.
			</p>
			&nbsp;<p>
				The ray is checked against the models' bounding spheres, so the result will not
				be pixel perfect. However, in many cases, this approach will be "good enough."
			</p>
	</div>
		<a name="ID2ECF"></a><h1 class="heading">Going Beyond</h1><div id="ID2ECF" class="hxnx1">
			
			<p>
				It is possible that the ray could intersect multiple models at once. Try to change the
				code so that only the closest intersection is reported as an intersection. To do this,
				you'll have to change the <b>RayIntersectsModel</b> function to keep track of the closest collision.
				You can determine the closest collision by using the result of <b>BoundingSphere.Intersects(Ray)</b> 
        function.
			</p>
		</div>


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