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TrailRenderer that maintains a width in screen space (URP)
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| public class PixelPerfectTrail : MonoBehaviour | |
| { | |
| [SerializeField] private TrailRenderer trail = null; | |
| [Tooltip("How small the trail width is allowed to get in pixels.")] | |
| public float MinimumPixelSize = 1.5f; | |
| private float startSize = 1f; | |
| private void Awake() | |
| { | |
| startSize = trail.widthMultiplier; | |
| } | |
| private void OnEnable() | |
| { | |
| RenderPipelineManager.beginCameraRendering += ScaleWithDistance; | |
| } | |
| private void OnDisable() | |
| { | |
| RenderPipelineManager.beginCameraRendering -= ScaleWithDistance; | |
| } | |
| private void ScaleWithDistance(ScriptableRenderContext context, Camera cam) | |
| { | |
| float distance = Vector3.Distance(cam.transform.position, transform.position); | |
| float currentPixelSize = DistanceAndDiameterToPixelSize(distance, startSize, cam); | |
| if (currentPixelSize < MinimumPixelSize) | |
| { | |
| float scaledWidth = PixelSizeAndDistanceToDiameter(MinimumPixelSize, distance, cam); | |
| trail.widthMultiplier = scaledWidth; | |
| } | |
| else | |
| { | |
| trail.widthMultiplier = startSize; | |
| } | |
| } | |
| // Get the diameter of an object, given its screen size in pixels and distance. By Elecman: | |
| // https://forum.unity.com/threads/this-script-gives-you-objects-screen-size-in-pixels.48966/#post-2107126 | |
| private float PixelSizeAndDistanceToDiameter(float pixelSize, float distance, Camera cam) | |
| { | |
| float diameter = (pixelSize * distance * cam.fieldOfView) / (Mathf.Rad2Deg * Screen.height); | |
| return diameter; | |
| } | |
| // Get the screen size of an object in pixels, given its distance and diameter. By Elecman: | |
| // https://forum.unity.com/threads/this-script-gives-you-objects-screen-size-in-pixels.48966/#post-2107126 | |
| private float DistanceAndDiameterToPixelSize(float distance, float diameter, Camera cam) | |
| { | |
| float pixelSize = (diameter * Mathf.Rad2Deg * Screen.height) / (distance * cam.fieldOfView); | |
| return pixelSize; | |
| } | |
| } |
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