Which is the best shape for collision detection?

Which is the best shape for collision detection?

Rectangle vs Rectangle. A rectangle in computing usually refers to a shape with 4 corners and 2 parallel sides and is a common shape for use in collision detection due to its simplicity to make and detect collisions with. Rectangles are often used to define a collision boxes for entities that don’t require precise detection.

Why do we use rectangles in collision detection?

To make this more useful we can put it all in one method so all we have to do is ask is circle1 touching circle 2 and that is done with this method. A rectangle in computing usually refers to a shape with 4 corners and 2 parallel sides and is a common shape for use in collision detection due to its simplicity to make and detect collisions with.

How to normalize a vector in collision detection?

Next, you get a vector to represent a line to the centre of the circle. Normalize this value and find the dot product between this line and the first line.

How are convex polygons used in collision detection?

Concave polygons can have parts that extrude out and allow vertices to completely go through another polygon and this stops our function from returning true as we’re only checking if points are inside a polygon. If you need to check convex polygons I recommend using the separating axis theorem method.

How does collision detection work in a polygon?

We have a function to check if a point is in a polygon and it can be used for every vertex in a polygon to allow us to check if a polygon is in a polygon. So if all 5 points of a pentagon are not inside a polygon then we know the polygons are not colliding and if at least one point is inside then we know the polygon is colliding.

How to check if two rectangles are colliding?

Rectangles are often used to define a collision boxes for entities that don’t require precise detection. So how do we check if 2 rectangles are colliding? we check to see if 2 of the sides fall in between the other rectangle. Lets take a look at two rectangles about to collide:

Circle Collision. Another simple shape for collision detection is between two circles. This algorithm works by taking the centre points of the two circles and ensuring the distance between the centre points are less than the two radii added together.

How does collision detection work between two circles?

Circle Collision. Another simple shape for collision detection is between two circles. This algorithm works by taking the centre points of the two circles and ensuring the distance between the centre points are less than the two radii added together. Move the circle with arrow keys.

How to test if a polygon has collided with a circle?

To test if a circle has collided with a polygon, we can simplify the problem to a series of Line/Circle collisions, one for each side of the polygon. Since we’ve already covered the steps to go through the vertices as lines, and Line/Circle collisions, let’s just look at the test for each side: Cool!

What can you do with polygon collision detection?

We can build on previous code this way, allowing flexible, complex code to emerge from simpler pieces.