A viewer is located at position (2, 3, 5) looking at the car locate at origin (0, 0, 0). Find out the axes orientation with respect to the viewer. Assume the viewer is on the ground.
Question
A viewer is located at position (2, 3, 5) looking at the car locate at origin (0, 0, 0). Find out the axes orientation with respect to the viewer. Assume the viewer is on the ground.
Solution
To find out the axes orientation with respect to the viewer, we need to calculate the direction vector from the viewer's position to the car's position.
Step 1: Identify the viewer's position and the car's position. The viewer's position is (2, 3, 5) and the car's position is at the origin (0, 0, 0).
Step 2: Calculate the direction vector. The direction vector from the viewer to the car is calculated by subtracting the viewer's position from the car's position.
So, the direction vector is (0-2, 0-3, 0-5) = (-2, -3, -5).
Step 3: Normalize the direction vector. To get the unit direction vector, we divide each component of the direction vector by its magnitude. The magnitude of the direction vector is sqrt((-2)^2 + (-3)^2 + (-5)^2) = sqrt(4 + 9 + 25) = sqrt(38).
So, the unit direction vector is (-2/sqrt(38), -3/sqrt(38), -5/sqrt(38)).
This unit direction vector gives the orientation of the x-axis with respect to the viewer. The y-axis and z-axis will be perpendicular to this direction.
The y-axis can be any vector that is perpendicular to the x-axis. One way to find such a vector is to use the cross product of the x-axis vector and any other vector.
The z-axis is then the cross product of the x-axis and y-axis.
So, the axes orientation with respect to the viewer is given by the unit direction vector and the y-axis and z-axis found as described above.
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