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Assets/RealisticCarControllerV3/Scripts/RCC_Emission.cs

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+//----------------------------------------------
+//            Realistic Car Controller
+//
+// Copyright © 2014 - 2023 BoneCracker Games
+// https://www.bonecrackergames.com
+// Buğra Özdoğanlar
+//
+//----------------------------------------------
+
+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+
+/// <summary>
+/// Applies emission texture to the target renderer.
+/// </summary>
+[System.Serializable]
+public class RCC_Emission {
+
+    public Renderer lightRenderer;      //  Renderer of the light.
+
+    public int materialIndex = 0;       //  Index of the material.
+    public bool noTexture = false;      //  Material has no texture.
+    public bool applyAlpha = false;     //  Apply alpha channel.
+    [Range(.1f, 10f)] public float multiplier = 1f;     //  Emission multiplier.
+    private int emissionColorID;        //  ID of the emission color.
+
+    private Material material;
+    private Color targetColor;
+
+    private bool initialized = false;
+
+    /// <summary>
+    /// Initializes the emission.
+    /// </summary>
+    public void Init() {
+
+        //  If no renderer selected, return.
+        if (!lightRenderer) {
+
+            Debug.LogError("No renderer selected for emission! Selected a renderer for this light, or disable emission.");
+            return;
+
+        }
+
+        material = lightRenderer.materials[materialIndex];      //  Getting correct material index.
+        material.EnableKeyword("_EMISSION");        //  Enabling keyword of the material for emission.
+        emissionColorID = Shader.PropertyToID("_EmissionColor");        //  Getting ID of the emission color.
+
+        //  If material has no property for emission color, return.
+        if (!material.HasProperty(emissionColorID))
+            Debug.LogError("Material has no emission color id!");
+
+        initialized = true;     //  Emission initialized.
+
+    }
+
+    /// <summary>
+    /// Sets emissive strength of the material.
+    /// </summary>
+    /// <param name="sharedLight"></param>
+    public void Emission(Light sharedLight) {
+
+        //  If not initialized, initialize and return.
+        if (!initialized) {
+
+            Init();
+            return;
+
+        }
+
+        //  If light is not enabled, return with 0 intensity.
+        if (!sharedLight.enabled)
+            targetColor = Color.white * 0f;
+
+        //  If intensity of the light is close to 0, return with 0 intensity.
+        if (Mathf.Approximately(sharedLight.intensity, 0f))
+            targetColor = Color.white * 0f;
+
+        //  If no texture option is enabled, set target color with light color. Otherwise, set target color with Color.white.
+        if (!noTexture)
+            targetColor = Color.white * sharedLight.intensity * multiplier;
+        else
+            targetColor = sharedLight.color * sharedLight.intensity * multiplier;
+
+        //  If apply alpha is enabled, set color of the material with alpha channel.
+        if (applyAlpha)
+            targetColor = new Color(targetColor.r, targetColor.g, targetColor.b, sharedLight.intensity * multiplier);
+
+        //  And finally, set color of the material with correct ID.
+        if (material.GetColor(emissionColorID) != (targetColor))
+            material.SetColor(emissionColorID, targetColor);
+
+    }
+
+}