public static Mesh GeneratePlane(PlaneGenerationData data)
{
StringBuilder nameBuilder = new StringBuilder("Procedural Plane [", 28);
nameBuilder.Append(data.length);
nameBuilder.Append("x");
nameBuilder.Append(data.width);
nameBuilder.Append("][");
nameBuilder.Append(data.verticesPerLength);
nameBuilder.Append(",");
nameBuilder.Append(data.verticesPerWidth);
nameBuilder.Append("]");
Vector3[] vertices = new Vector3[data.verticesPerLength * data.verticesPerWidth];
Vector2[] uv = new Vector2[vertices.Length];
Vector4[] tangents = new Vector4[vertices.Length];
Vector4 tangent = new Vector4(1f, 0f, 0f, -1f);
switch (data.direction)
{
case PlaneGenerationData.Direction.XY: tangent = new Vector4(1f, 0f, 0f, -1f); break;
case PlaneGenerationData.Direction.XZ: tangent = new Vector4(1f, 0f, 0f, -1f); break;
case PlaneGenerationData.Direction.YZ: tangent = new Vector4(0f, 0f, 1f, -1f); break;
default: tangent = Vector4.zero; break;
}
for (int i = 0, w = 0; w < data.verticesPerWidth; w++)
{
for (int l = 0; l < data.verticesPerLength; l++, i++)
{
float u = l / (float)(data.verticesPerLength - 1);
float v = w / (float)(data.verticesPerWidth - 1);
float x = -data.length / 2f + data.length * u;
float y = -data.width / 2f + data.width * v;
Vector3 position;
switch (data.direction)
{
case PlaneGenerationData.Direction.XY: position = new Vector3(x, y, 0f); break;
case PlaneGenerationData.Direction.XZ: position = new Vector3(x, 0f, y); break;
case PlaneGenerationData.Direction.YZ: position = new Vector3(0f, y, x); break;
default: position = Vector3.zero; break;
}
vertices[i] = position;
uv[i] = new Vector2(u, v);
tangents[i] = tangent;
}
}
int[] triangles = new int[(data.verticesPerLength - 1) * (data.verticesPerWidth - 1) * 6];
for (int vi = 0, ti = 0, w = 0; w < data.verticesPerWidth - 1; w++, vi++)
{
for (int l = 0; l < data.verticesPerLength - 1; l++, vi++, ti += 6)
{
triangles[ti] = vi;
triangles[ti + 3] = triangles[ti + 2] = vi + 1;
triangles[ti + 4] = triangles[ti + 1] = vi + data.verticesPerLength;
triangles[ti + 5] = vi + data.verticesPerLength + 1;
}
}
Mesh mesh = new Mesh {
name = nameBuilder.ToString(),
vertices = vertices,
triangles = triangles,
uv = uv
};
mesh.RecalculateNormals();
mesh.tangents = tangents;
return(mesh);
}
private void OnPlaneGenerationGUI()
{
planeGenerationData = planeGenerationData ?? new PlaneGenerationData();
planeGenerationData.direction = (PlaneGenerationData.Direction)UG.EnumPopup("平面方向", planeGenerationData.direction);
UG.BeginHorizontal();
planeGenerationData.length = UG.DelayedFloatField("长", planeGenerationData.length);
planeGenerationData.width = UG.DelayedFloatField("宽", planeGenerationData.width);
UG.EndHorizontal();
UG.BeginHorizontal();
planeGenerationData.verticesPerLength = UG.DelayedIntField("长顶点数", planeGenerationData.verticesPerLength);
planeGenerationData.verticesPerWidth = UG.DelayedIntField("宽顶点数", planeGenerationData.verticesPerWidth);
UG.EndHorizontal();
bool legal = true;
string errorMessage = String.Empty;
if (defaultMaterial == null)
{
legal = false;
errorMessage += "默认材质不能为空";
}
if (planeGenerationData.length <= 0)
{
legal = false;
errorMessage += "平面长必须大于0\n";
}
if (planeGenerationData.width <= 0)
{
legal = false;
errorMessage += "平面宽必须大于0\n";
}
if (planeGenerationData.verticesPerLength <= 0)
{
legal = false;
errorMessage += "平面长顶点数必须大于0\n";
}
if (planeGenerationData.verticesPerWidth <= 0)
{
legal = false;
errorMessage += "平面宽顶点数必须大于0\n";
}
if (legal)
{
if (GUILayout.Button("生成"))
{
MeshTool.InstantiatePlane(planeGenerationData, defaultMaterial);
}
}
else
{
UG.HelpBox(errorMessage, MessageType.Error);
}
}
public static GameObject InstantiatePlane(PlaneGenerationData data, Material material) => InstantiateMeshGameObject(GeneratePlane(data), material);
