How do you know if two polygons intersect?
If, after checking each line from both polygons, no separating axis was found, it has been proven that the polygons intersect and something has to be done about it. if the polygons are always convex, first calculate the angle of a line drawn from center to center of the polygons.
Do polygons intersect?
Polygons can intersect in three ways: Overlap—Area of overlap can be produced by leaving the Output Type to its default value (LOWEST). Common boundary/touch at a line—This type of intersection can be produced by specifying LINE as the Output Type.
How do you find the IoU of two polygons?
About the IoU calculation method Given two convex polygons Q1 and Q2 , the IoU ration of Q1 and Q2 is estimated as: Area(Q1+Q2) = Area(Q1) + Area(Q2) – Area(Q1*Q2) IoU = Area(Q1*Q2) / Area(Q1+Q2) ‘+’ means union; ‘*’ means intersection.
How do you check if two polygons overlap?
From a geometry perspective, there are conditions that are fulfilled by overlapping polygons. 1) If a segment in A crosses a segment in B, the polygons overlap. 2) If all vertices in B are inside A, or vice-versa, the polygons overlap. 3) If all vertices in A are also vertices of B, the polygons overlap.
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!
How does collision detection work in a polygon?
There are several methods, the simple is just to check if there is and overlap in X or Y bounds. This however only works with rectangles aligned with the axis. There is bounds checking, is the corner of one object withing the bounds of coordinates of the other. From there collision detection gets more advanced.
What happens if both checks on a polygon are true?
If both checks are true, we switch collision to its opposite value. This is different than our previous tests, where we set the collision to simply true or false. After we’ve gone through all the vertices, whatever the final state of collision is is the result. Here’s a full example with everything together:
When is Collision Detected between two shape objects?
If the second polygon is not risen, and both polygons are visible by the “draw” command, they intersect with their outlines but collision is not detected: