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试着做下光影玩法

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This commit is contained in:
游戏糕手爱丽丝
2025-10-13 11:10:52 +08:00
parent 45793ba957
commit 0fd74a1a45
14 changed files with 1331 additions and 109 deletions
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8
Assets/Scripts/Test/Light.meta Normal file
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82
Assets/Scripts/Test/Light/RaycastShadowCollider.cs Normal file
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using UnityEngine;
using System.Collections.Generic;
public class RaycastShadowCollider : MonoBehaviour
{
public Light spotLight; // <20>۹<EFBFBD><DBB9><EFBFBD>
public GameObject shadowCaster; // Ͷ<><CDB6><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
public int rayCount = 36; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
public float maxShadowDistance = 10f;
private PolygonCollider2D shadowCollider;
void Start()
{
shadowCollider = GetComponent<PolygonCollider2D>();
if (shadowCollider == null)
shadowCollider = gameObject.AddComponent<PolygonCollider2D>();
}
void Update()
{
UpdateShadowCollider();
}
void UpdateShadowCollider()
{
List<Vector2> shadowPoints = new List<Vector2>();
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߽<EFBFBD><DFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƹⷽ<C6B9><E2B7BD>Ͷ<EFBFBD><CDB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Bounds bounds = shadowCaster.GetComponent<Renderer>().bounds;
Vector3[] boundPoints = GetBoundPoints(bounds);
foreach (Vector3 point in boundPoints)
{
Vector3 toLight = (spotLight.transform.position - point).normalized;
Ray ray = new Ray(point, toLight);
RaycastHit hit;
if (Physics.Raycast(ray, out hit, maxShadowDistance))
{
if (hit.collider.gameObject == gameObject) // <20><><EFBFBD><EFBFBD>ǽ<EFBFBD><C7BD>
{
// ת<><D7AA><EFBFBD><EFBFBD>ǽ<EFBFBD><C7BD><EFBFBD>ľֲ<C4BE><D6B2><EFBFBD><EFBFBD><EFBFBD>ϵ
Vector3 localHit = transform.InverseTransformPoint(hit.point);
shadowPoints.Add(new Vector2(localHit.x, localHit.y));
}
}
}
// <20>Ե<EFBFBD><D4B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>γ<EFBFBD>͹<EFBFBD><CDB9>
if (shadowPoints.Count > 2)
{
List<Vector2> convexHull = ComputeConvexHull(shadowPoints);
shadowCollider.SetPath(0, convexHull);
}
}
Vector3[] GetBoundPoints(Bounds bounds)
{
return new Vector3[]
{
bounds.min,
bounds.max,
new Vector3(bounds.min.x, bounds.min.y, bounds.max.z),
new Vector3(bounds.min.x, bounds.max.y, bounds.min.z),
new Vector3(bounds.max.x, bounds.min.y, bounds.min.z),
new Vector3(bounds.min.x, bounds.max.y, bounds.max.z),
new Vector3(bounds.max.x, bounds.min.y, bounds.max.z),
new Vector3(bounds.max.x, bounds.max.y, bounds.min.z)
};
}
// ͹<><CDB9><EFBFBD>㷨<EFBFBD><E3B7A8>Graham Scan<61><6E>
List<Vector2> ComputeConvexHull(List<Vector2> points)
{
if (points.Count < 3) return points;
// ʵ<><CAB5>͹<EFBFBD><CDB9><EFBFBD>㷨...
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9>Unity<74><79>Collider2D.CreatePrimitive<76><65><EFBFBD>ߵ<EFBFBD><DFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
return points; // <20>򻯷<EFBFBD><F2BBAFB7><EFBFBD>
}
}

11
Assets/Scripts/Test/Light/RaycastShadowCollider.cs.meta Normal file
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124
Assets/Scripts/Test/Light/ShadowColliderGenerator.cs Normal file
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using UnityEngine;
using System.Collections.Generic;
public class ShadowColliderGenerator : MonoBehaviour
{
public Camera shadowCamera; // ר<><D7A8><EFBFBD><EFBFBD>Ⱦ<EFBFBD><C8BE>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
public RenderTexture shadowRT; // <20><>Ⱦ<EFBFBD><C8BE><EFBFBD><EFBFBD>
public LayerMask shadowCasterLayer; // Ͷ<><CDB6><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
public float colliderPrecision = 0.1f; // <20><>ײ<EFBFBD>徫<EFBFBD><E5BEAB>
private Texture2D processedTexture;
private PolygonCollider2D polygonCollider;
void Start()
{
// <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>Ⱦ<EFBFBD><C8BE><EFBFBD><EFBFBD>
shadowRT = new RenderTexture(512, 512, 24);
shadowCamera.targetTexture = shadowRT;
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><C3B5><EFBFBD><EFBFBD><EFBFBD>
processedTexture = new Texture2D(512, 512, TextureFormat.RGB24, false);
polygonCollider = GetComponent<PolygonCollider2D>();
if (polygonCollider == null)
polygonCollider = gameObject.AddComponent<PolygonCollider2D>();
}
void Update()
{
GenerateShadowCollider();
}
void GenerateShadowCollider()
{
// 1. <20><>Ⱦ<EFBFBD><C8BE>Ӱ<EFBFBD><D3B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
shadowCamera.Render();
// 2. <20><>GPU<50><55>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>CPU
RenderTexture.active = shadowRT;
processedTexture.ReadPixels(new Rect(0, 0, shadowRT.width, shadowRT.height), 0, 0);
processedTexture.Apply();
RenderTexture.active = null;
// 3. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӱ<EFBFBD><D3B0>Ե
List<Vector2> edgePoints = DetectEdges(processedTexture);
// 4. ת<><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>겢<EFBFBD><EAB2A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ײ<EFBFBD><D7B2>
if (edgePoints.Count > 2)
{
List<Vector2> worldPoints = ConvertToWorldCoordinates(edgePoints);
polygonCollider.SetPath(0, worldPoints);
}
}
List<Vector2> DetectEdges(Texture2D texture)
{
List<Vector2> edges = new List<Vector2>();
Color[] pixels = texture.GetPixels();
int width = texture.width;
int height = texture.height;
// <20>򵥵ı<F2B5A5B5>Ե<EFBFBD><D4B5><EFBFBD><EFBFBD><EFBFBD>㷨
for (int y = 1; y < height - 1; y += (int)(1f / colliderPrecision))
{
for (int x = 1; x < width - 1; x += (int)(1f / colliderPrecision))
{
int index = y * width + x;
// <20><><EFBFBD>鵱ǰ<E9B5B1><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD><CEA7><EFBFBD>صIJ<D8B5><C4B2><EFBFBD>
if (IsEdgePixel(pixels, index, width))
{
edges.Add(new Vector2(x, y));
}
}
}
return edges;
}
bool IsEdgePixel(Color[] pixels, int index, int width)
{
Color current = pixels[index];
float currentBrightness = current.r + current.g + current.b;
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
float[] neighborBrightness = new float[4]
{
pixels[index - 1].r + pixels[index - 1].g + pixels[index - 1].b, // <20><>
pixels[index + 1].r + pixels[index + 1].g + pixels[index + 1].b, // <20><>
pixels[index - width].r + pixels[index - width].g + pixels[index - width].b, // <20><>
pixels[index + width].r + pixels[index + width].g + pixels[index + width].b // <20><>
};
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ھӲ<DABE><D3B2><EFBFBD><EFBFBD>ϴ<EFBFBD><CFB4><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>DZ<EFBFBD>Ե
float threshold = 0.3f;
for (int i = 0; i < 4; i++)
{
if (Mathf.Abs(currentBrightness - neighborBrightness[i]) > threshold)
return true;
}
return false;
}
List<Vector2> ConvertToWorldCoordinates(List<Vector2> texturePoints)
{
List<Vector2> worldPoints = new List<Vector2>();
Bounds wallBounds = GetComponent<Collider2D>().bounds;
foreach (Vector2 point in texturePoints)
{
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊǽ<CEAA><C7BD><EFBFBD>ֲ<EFBFBD><D6B2><EFBFBD><EFBFBD><EFBFBD>
Vector2 localPoint = new Vector2(
point.x / shadowRT.width * wallBounds.size.x - wallBounds.size.x * 0.5f,
point.y / shadowRT.height * wallBounds.size.y - wallBounds.size.y * 0.5f
);
worldPoints.Add(localPoint);
}
return worldPoints;
}
}

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Assets/Scripts/Test/Light/ShadowColliderGenerator.cs.meta Normal file
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40
Assets/Scripts/Test/Light/ShadowRT.renderTexture Normal file
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m_ImageContentsHash:
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m_Width: 256
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m_AntiAliasing: 1
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8
Assets/Scripts/Test/Light/ShadowRT.renderTexture.meta Normal file
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