# Ballistic Path Line Render {% hint style="success" %} #### Like what you are seeing? Support us as a [GitHub Sponsor](/old-kb/where-to-buy/become-a-sponsor.md) and get instant access to all our assets, exclusive tools and assets, escalated support and issue tracking and our gratitude.\ \ These articles are made possible by our [GitHub Sponsors](/old-kb/where-to-buy/become-a-sponsor.md) ... become a sponsor today! {% endhint %} ## Introduction An add on for Unity's Line Renderer this component can simulate the ballistic trajectory defined by its launch settings and optionally calculate collision and bounces. This component on its own is useful for common cases such as showing the path of a grenade, arrow, thrown object like a basketball, etc. This component is also an excellent demonstration of the [API.Ballistic.Raycast](/old-kb/toolkit-for-physics/physkit/api/ballistics.md#raycast) feature. ## Fields and Attributes ### Start The point the projectile will start at. ### Gravity The effect of gravity ### Velocity The velocity of the projectile ### Run on Start Should the simulation be ran on the OnStart event from Unity ### Continuous Run Should the simulation be updated ever frame ### Collision Layers If we use collision what should we collide with ... set this to none to disable collision ### Resolution How far should each step test ### Max Length How far should the simulation test ### Max Bounces How many bounces should be calculated, 0 to disable bounce calculation ### Bounce Damping How much velocity should be reduced per bounce ... this is a crude simulation of Unity's "bounciness" it will not map 1 to 1 in most cases but is a fair approximation. ### Trajectory A list of points along the path, the distance between each point is equal to the resolution ### Impacts A list of RaycastHit values for each impact point if any ## Methods ### Simulate Call this method to update the simulation, if you have set this Continuous Run this will be called automatically on LateUpdate. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://kb.heathen.group/old-kb/toolkit-for-physics/physkit/components/ballistic-path-line-render.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.