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Direction, how much closer did you get to the plane You can find this length by projecting the rayDirection on the plane s normal, which is done by taking their dot product This length is also indicated to the right of Figure 4-26 You know how much one rayDirection brings you to the plane and you know how far rayPosition is from the plane, so you can calculate how many times you should add the ray Direction to the rayPosition point to hit the plane! This factor is what the method returns and can be used to find the exact position of the intersection between the Ray and the Plane Start from the definition point of the Ray (=rayPosition) and add the Ray s direction multiplied by this factor, and you obtain the position of the collision point.

The Clone Method...............................................................................................................................366

Any communication, irrespective of whether or not there is a promotional offer, will increase visits.

Comparing Array Types ...............................................................................................368 15: Delegates......................................................................................369 What Is a Delegate .....................................................................................................370 Declaring the Delegate Type........................................................................................372 Creating the Delegate Object.......................................................................................373 Assigning Delegates ....................................................................................................375 Combining Delegates...................................................................................................376 Adding Methods to Delegates......................................................................................377 Removing Methods from a Delegate ...........................................................................378 Invoking a Delegate .....................................................................................................379

Delegate Example........................................................................................................380 Invoking Delegates with Return Values .......................................................................381 Invoking Delegates with Reference Parameters..........................................................382 Anonymous Methods ...................................................................................................383

ustomer communications work. They get people to come back, improve cross sales, and result in upgrades and higher retention rates. And now, because of the Internet, their cost is at an all-time low. To see how communications work, let s look at a few examples.

Using Anonymous Methods ................................................................................................................383 Syntax of Anonymous Methods ..........................................................................................................384 Scope of Variables and Parameters ...................................................................................................386

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A lighting manufacturer based in Milwaukee used a catalog to market its products to 45,000 contractors and builders. Business was both good and pro table. A consultant at Hunter Business Direct thought that sales could be made even higher through the use of customer communications. His suggestions were greeted with skepticism, but higher management was persuaded to give him a 6-month test. He took the top 1200 customers and divided them into two similar groups: a test group and a control group. The control group was given the same wonderful service that was given to all other customers: Wait for the phone to ring and ful ll the order rapidly. For the test group, the consultant set up a two-person communications team. A lighting engineer was paired with a customer service rep.

Lambda Expressions....................................................................................................388 16: Events...........................................................................................391 Events Are Like Delegates ...........................................................................................392

An Event Has a Private Delegate ........................................................................................................393

Their job was to call each one of the 600 companies in the test group, find out who the decision makers were, and talk to them. The purpose of the calls was not to make sales. In fact, the team was not empowered to offer discounts. The purpose of the calls was to discuss the customers lighting needs. Were there new products on the market that they did not nd in the catalog What problems had they had in installations Where did they see the industry going Did they need training Did they have suggestions This went on for 6 months, after which the consultant did a complete report on the results. His ndings were truly amazing. In the rst place, during the 6 months, the test group placed 12 percent more orders than they had in the previous 6 months. The control group placed 18 percent fewer orders! The test group s average order size grew by 14 percent, whereas the control group s order size shrank by 14 percent. In total, the test group purchased $2.6 million more product than the control group did, spending 27 percent more than they had previously, whereas the control group s total purchases fell by 30 percent. The total cost of the experiment was about $60,000, including the salaries and expenses of the two communicators and the cost of their telephone calls. The increase in sales per dollar spent was a staggering $43. The heart of this test was the brilliant plan of setting aside the 600company control group. Without this group, no one would have known how successful the communications program was. This is an experiment that can be repeated in virtually any business-to-business marketing situation.

This is done in your ModelRayCollision method: Vector3 intersectionPoint = rayPosition + distanceOnRay * rayDirection; Checking Whether a Point Is Inside a Triangle Luckily, things aren t over yet Now that you know where the ray intersects with the triangle s plane, you should check whether the intersection point is inside the triangle Otherwise, the Ray and the Triangle clearly don t collide This can again be done using a vector-based approach Figure 4-27 demonstrates the general idea If you keep in mind that the collPoint is in the same plane as the triangle, the image is not that complicated..

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