public void BuildDecal(DecalBuildInfo decalInfo, string decalAltasName = "DecalDefault")
{
Material decalMat = null;
if (decalInfo.decalMat == null) //没有专门指定材质球
{
if (decalAltasName != "" && decalMatPool.ContainsKey(decalAltasName))
{
decalMat = decalMatPool[decalAltasName];
}
else
{
Shader decalShader = AssetBundleManager.GetShader("Decal/Default");
decalMat = new Material(decalShader);
decalMatPool.Add(decalAltasName, decalMat);
}
}
else
{
decalMat = decalInfo.decalMat;
}
decalMat.mainTexture = decalInfo.decalSprite.texture;
Decal decal = CreateDecalObj(decalInfo.decalPos, decalInfo.decalEulerAngle, decalInfo.decalScale);
decal.SetMaterial(decalMat);
decal.DecalSprite = decalInfo.decalSprite;
//淡入淡出
decal.decalFadeInTime = decalInfo.decalFadeInTime;
decal.decalFadeTime = decalInfo.decalFadeTime;
decal.decalFadeOutTime = decalInfo.decalFadeOutTime;
BuildDecalMesh(decal);
}
private Decal CreateDecalObj(Vector3 position, Vector3 eulerAngle, Vector3 scale)
{
GameObject decalObj = new GameObject();
decalObj.layer = LayerMask.NameToLayer(Config.LayerIngoreRayCast);
Decal decal = decalObj.AddComponent <Decal>();
decal.m_Filter = decalObj.GetComponent <MeshFilter>();
decal.m_Render = decalObj.GetComponent <MeshRenderer>();
decal.transform.position = position;
decal.transform.eulerAngles = eulerAngle;
decal.transform.localScale = scale;
decal.affectedLayers = 1 << LayerMask.NameToLayer(Config.LayerBuilding);
decal.affectedLayers = decal.affectedLayers & (~(1 << decalObj.layer));
return(decal);
}
private void BuildDecalMesh(Decal decal)
{
GameObject[] affectedObjects = GetAffectedObjects(decal.GetBounds(), decal.affectedLayers);
foreach (GameObject go in affectedObjects)
{
DecalBuilder.BuildDecalForObject(decal, go);
}
DecalBuilder.Push(decal.pushDistance);
Mesh mesh = DecalBuilder.CreateMesh();
if (mesh != null)
{
mesh.name = "DecalMesh";
decal.m_Filter.mesh = mesh;
}
}
public static void BuildDecalForObject(Decal decal, GameObject affectedObject)
{
Mesh affectedMesh = affectedObject.GetComponent <MeshCollider>().sharedMesh;
affectedMesh.MarkDynamic();
if (affectedMesh == null)
{
return;
}
float maxAngle = decal.maxAngle;
Plane right = new Plane(Vector3.right, Vector3.right / 2f);
Plane left = new Plane(-Vector3.right, -Vector3.right / 2f);
Plane top = new Plane(Vector3.up, Vector3.up / 2f);
Plane bottom = new Plane(-Vector3.up, -Vector3.up / 2f);
Plane front = new Plane(Vector3.forward, Vector3.forward / 2f);
Plane back = new Plane(-Vector3.forward, -Vector3.forward / 2f);
Vector3[] vertices = affectedMesh.vertices;
int[] triangles = affectedMesh.triangles;
int startVertexCount = bufVertices.Count;
Matrix4x4 matrix = decal.transform.worldToLocalMatrix * affectedObject.transform.localToWorldMatrix;
for (int i = 0; i < triangles.Length; i += 3)
{
int i1 = triangles[i];
int i2 = triangles[i + 1];
int i3 = triangles[i + 2];
Vector3 v1 = matrix.MultiplyPoint(vertices[i1]);
Vector3 v2 = matrix.MultiplyPoint(vertices[i2]);
Vector3 v3 = matrix.MultiplyPoint(vertices[i3]);
Vector3 side1 = v2 - v1;
Vector3 side2 = v3 - v1;
Vector3 normal = Vector3.Cross(side1, side2).normalized;
if (Vector3.Angle(-Vector3.forward, normal) >= maxAngle)
{
continue;
}
DecalPolygon poly = new DecalPolygon(v1, v2, v3);
poly = DecalPolygon.ClipPolygon(poly, right);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, left);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, top);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, bottom);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, front);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, back);
if (poly == null)
{
continue;
}
AddPolygon(poly, normal);
}
GenerateTexCoords(startVertexCount, decal.DecalSprite);
}