Raycasting and 3D Projection Quiz

What is the purpose of a raycaster in coding?

• To play music

• To calculate distances and make light rays

• To draw 2D shapes of banana

• To create rays that measure distance

What is the first step in firing a simple projectile in raycasting?

• Create a new sprite

• Delete all blocks

• Set rotation style to 'don't rotate'

• Switch to the hitbox costume

Why is it important to move the projectile by 4 pixels at a time?

• To skip over walls without colliding

• To make the projectile move slower

• To avoid leaving gaps between sensing locations

• To embed the projectile deeply in a wall

Answer explanation

If you did not do this, your raycaster would just glitch through the wall!

What is the purpose of using 'run without screen refresh' in the raycasting project?

• To animate the flight of the projectile

• To reverse the projectile back out of the wall

• To draw a line between the player and the collision

• To instantly find the wall when the projectile collides

Answer explanation

If you had runned with screen refresh, there would have been an animation that would have been repeatedly playing, FOREVER pausing the game.

What is the purpose of the Pen Extension in raycasting?

• To erase all blocks

• To draw a line between the player and the collision

• To create a new sprite

• To set the pen size to 4

Answer explanation

If there was no pen extension there would be no walls or anything to measure with

What does FOV stand for in raycasting?

• Field Of Vision

• Fading Optical Vision

• Frequency of Vibration

• Focal Overhead View

What is the purpose of the 'distance to - Player' block in 3D projection?

• To set the x position for drawing the wall

• To calculate the distance a ray has traveled

• To calculate the height of the wall

• To draw a slice of wall

What is the purpose of the 'height' variable in 3D projection?

• To draw a slice of wall

• To calculate the height of the wall

• To calculate the distance a ray has traveled

• To set the x position for drawing the wall

Answer explanation

With this = game

without this = no walls

What is the purpose of using 'set ghost effect' in hiding the 2D map?

• To hide the 2D map

• To change the color of the 2D map

• To make the 2D map transparent

• To delete the 2D map

Answer explanation

We must do this, or your vision is obstructed!

What is the main benefit of hiding the 2D map in the 3D projection?

• To simplify the coding process

• To speed up the raycasting process

• To reduce the number of rays being cast

• To improve the visual appearance of the 3D scene