This code is a Unity script that dynamically adjusts the...

December 30, 2024 at 09:30 AM

using UnityEngine;

public class FogColorController : MonoBehaviour
{
    [Header("Player Reference")]
    public Transform playerTransform; // Reference to the player's transform

    [Header("Y Position-Based Fog Color")]
    public Color startColor = Color.blue; // Fog color at the minimum Y position
    public Color endColor = Color.red;   // Fog color at the maximum Y position
    public float minY = 0f;              // Minimum Y position
    public float maxY = 100f;            // Maximum Y position

    [Header("Direction-Based Color Adjustment")]
    public Color forwardAdjustment = Color.green; // Adjustment when looking forward
    public Color backwardAdjustment = Color.yellow; // Adjustment when looking backward
    public Color upwardAdjustment = Color.cyan;    // Adjustment when looking upward
    public Color downwardAdjustment = Color.magenta; // Adjustment when looking downward
    public float adjustmentIntensity = 0.1f;        // Intensity of direction-based adjustment

    private Color currentFogColor;

    void Update()
    {
        if (playerTransform == null)
        {
            Debug.LogWarning("Player Transform is not assigned.");
            return;
        }

        // Calculate fog color based on Y position
        float t = Mathf.InverseLerp(minY, maxY, playerTransform.position.y);
        Color positionBasedColor = Color.Lerp(startColor, endColor, t);

        // Determine forward/backward adjustment
        float forwardness = Vector3.Dot(playerTransform.forward, Vector3.forward);
        Color forwardBackwardAdjustment = forwardness > 0
            ? Color.Lerp(Color.white, forwardAdjustment, forwardness * adjustmentIntensity)
            : Color.Lerp(Color.white, backwardAdjustment, -forwardness * adjustmentIntensity);

        // Determine upward/downward adjustment
        float upwardness = Vector3.Dot(playerTransform.forward, Vector3.up);
        Color upDownAdjustment = upwardness > 0
            ? Color.Lerp(Color.white, upwardAdjustment, upwardness * adjustmentIntensity)
            : Color.Lerp(Color.white, downwardAdjustment, -upwardness * adjustmentIntensity);

        // Combine adjustments
        Color directionalAdjustment = forwardBackwardAdjustment * upDownAdjustment;

        // Combine position-based color and direction adjustments
        currentFogColor = positionBasedColor * directionalAdjustment;

        // Apply the fog color
        RenderSettings.fogColor = currentFogColor;
    }
}

This code is a Unity script that dynamically adjusts the fog color in a scene based on both the Y position of a player's transform and the direction the player is facing. Here's a breakdown of what the code does:

Purpose

To calculate and set the RenderSettings.fogColor in Unity based on:

Player's vertical (Y-axis) position.
Player's facing direction in 3D space.

Key Components

Position-Based Fog Color:
- The startColor and endColor represent the fog color for the minimum (minY) and maximum (maxY) player Y position, respectively.
- The script interpolates a color (using Mathf.InverseLerp and Color.Lerp) to determine the fog color based on how high or low the player is on the Y-axis.
Direction-Based Fog Color Adjustment:
- Adjusts the fog color based on the player's forward-facing direction.
- Uses two directional adjustments:
  - Forward/Backward Adjustment: Based on how closely the player's forward vector (playerTransform.forward) aligns with the world's forward vector (Vector3.forward).
  - Upward/Downward Adjustment: Based on how closely the player's forward vector aligns with the world's upward vector (Vector3.up).
- Blends between adjustments (e.g., white → forwardAdjustment or backwardAdjustment) using Vector3.Dot to determine alignment and Color.Lerp.
Final Fog Color:
- Combines the position-based fog color with the directional adjustments by multiplying them (positionBasedColor * directionalAdjustment).
- Sets the resulting color as the fog color via RenderSettings.fogColor.

Details in `Update()` Method

Position-Based Color:
- Uses the player's Y position to interpolate between startColor and endColor. Higher Y positions produce a color closer to endColor.
Directional Adjustments:
- Forwardness: Calculates the alignment between the player's forward vector and the global forward direction.
  - Positive values adjust toward forwardAdjustment, negative values adjust toward backwardAdjustment.
- Upwardness: Calculates the alignment between the player's forward vector and the global upward direction.
  - Positive values adjust toward upwardAdjustment, negative values adjust toward downwardAdjustment.
Combine Adjustments:
- Combines forward/backward and upward/downward adjustments by multiplying their resulting colors.
Final Color:
- Multiplies the position-based and directional adjustment colors to determine the final fog color.
- Applies the final color to RenderSettings.fogColor.

Visual Effect

This script creates an immersive dynamic fog system:
- Fog changes based on player's height: E.g., fog starts blue at ground level and turns red at higher elevations.
- Fog adjusts based on facing direction:
  - Looking forward: Adds "greenish" tint (if forwardAdjustment = green).
  - Looking upward: Adds "cyan" tint (if upwardAdjustment = cyan).
  - Combined effects (e.g., forward + upward = a mix of green and cyan).

Edge Cases

If playerTransform is not assigned, the script logs a warning and stops execution to avoid runtime errors.

Summary

This script creates a highly customizable fog color system that reacts dynamically to the player's vertical position and their facing direction in the 3D space, enhancing the scene's visual feedback and providing environment-based immersion.

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