Knowledge Base

Article Number: 32 | VC3 | VC4 | Post Date: March 16, 2017 | Last Updated: March, 16 2017

What determines when tire marks are made in a simulation? Is there a way to turn them off?

Tire marks are made using a simple algorithm. For each individual tire, Virtual CRASH simply checks if the total tire force at the contact patch is greater than or equal to 95% of the maximum available tire force (adhesion value x normal force at the contact patch). If this condition is satisfied, then Virtual CRASH will draw a tire mark. This means a tire mark is simply a function of slip angle and the percent of available longitudinal tire force being used for the tire. Virtual CRASH is essentially indicating where an investigator might find tire marks due to slip at the contact patch, but it is not the intent of the algorithm to predict the existence of a tire mark at any specific location. As of March 16, 2017, the 95% threshold is not adjustable, but future updates may allow for the user to specify the threshold. 

If you do not wish the automatically generated tire marks to appear, or you wish to draw your own, the automatically generated tire marks are easy to disable in Virtual CRASH. Simply select your vehicle and go to the “tire marks” menu in the left side control panel. Use the color drop down menu, and set to full transparency. 

Below we see a simulation of a car entering a yaw maneuver with (right) and without (left) visible tire marks. 

Tags: tire marks, yaw marks, turn off yaw marks, skid marks, turn off skid marks, drawing skids, removing tire marks, turn off tire marks, braking marks, friction marks.

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