The complexity of an algorithm like this means we will need to consider performance optimization, covered in the next section. Usually games will split collision into two phases, broad and narrow. This can be implemented with a spacial data structure that will give you a rough idea of where the entity exists and what exist around it. When you have a small list of entities to check you will want to use a narrow phase algorithm like the ones listed above to provide a certain answer as to whether there is a collision or not.
Skip to main content Skip to search Skip to select language Game development Techniques for game development 2D collision detection Change language. More Definitions for collide. See the full definition for collide in the English Language Learners Dictionary.
Nglish: Translation of collide for Spanish Speakers. Britannica English: Translation of collide for Arabic Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of collide. Two helicopters collided. Examples of collide in a Sentence Two football players collided on the field.
Recent Examples on the Web When the teams collide again at p. Caruso, Anchorage Daily News , 10 Sep. First Known Use of collide , in the meaning defined at sense 1. This minimum energy with which molecules must be moving in order for a collision to result in a chemical reaction is known as the activation energy. As we know from the kinetic theory of gases, the kinetic energy of a gas is directly proportional to temperature.
As temperature increases, molecules gain energy and move faster and faster. Therefore, the greater the temperature, the higher the probability that molecules will be moving with the necessary activation energy for a reaction to occur upon collision. Even if two molecules collide with sufficient activation energy, there is no guarantee that the collision will be successful.
In fact, the collision theory says that not every collision is successful, even if molecules are moving with enough energy. The reason for this is because molecules also need to collide with the right orientation, so that the proper atoms line up with one another, and bonds can break and re-form in the necessary fashion. For example, in the gas-phase reaction of dinitrogen oxide with nitric oxide, the oxygen end of N 2 O must hit the nitrogen end of NO; if either molecule is not lined up correctly, no reaction will occur upon their collision, regardless of how much energy they have.
However, because molecules in the liquid and gas phase are in constant, random motion, there is always the probability that two molecules will collide in just the right way for them to react. Of course, the more critical this orientational requirement is, like it is for larger or more complex molecules, the fewer collisions there will be that will be effective.
An effective collision is defined as one in which molecules collide with sufficient energy and proper orientation, so that a reaction occurs. According to the collision theory, the following criteria must be met in order for a chemical reaction to occur:.
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