//读入顶点索引
void ReadVertexIndices(t3DObject pObject, tChunk pPreviousChunk)
{
int index = 0;
//读入该对象中面的数目
pPreviousChunk.bytesRead += fread(ref pObject.numOfFaces, 2, m_FilePointer);
//分配所有的储存空间，并初始化结构
pObject.pFaces = new tFace[pObject.numOfFaces];
//遍历对象中所有的面
for (int i = 0; i < pObject.numOfFaces; i++)
{
pObject.pFaces[i] = new tFace();
for (int j = 0; j < 4; j++)
{
//读入当前对象的第一个点
pPreviousChunk.bytesRead += fread(ref index, 2, m_FilePointer);
if (j < 3)
{
pObject.pFaces[i].vertIndex[j] = index;
}
}
}
}
//读入对象的材质名称
void ReadObjectMaterial(t3DModel pModel, t3DObject pObject, tChunk pPreviousChunk)
{
String strMaterial = ""; //用来保存对象的材质名称
int[] buffer = new int[50000]; //用来读入不需要的数据
//读入赋予当前对象的材质名称
pPreviousChunk.bytesRead += getStr(ref strMaterial);
//遍历所有的纹理
for (int i = 0; i < pModel.numOfMaterials; i++)
{
//如果读入的纹理与当前纹理名称匹配
if (strMaterial.Equals(pModel.pMaterials[i].strName))
{
//设置材质ID
pObject.materialID = i;
//判断是否是纹理映射，如果strFile是一个长度大于1的字符串，则是纹理
if (pModel.pMaterials[i].strFile.Length > 0)
{
//设置对象的纹理映射标志
pObject.bHasTexture = true;
}
break;
}
else
{
//如果该对象没有材质，则设置ID为-1
pObject.materialID = -1;
}
}
pPreviousChunk.bytesRead += fread(ref buffer, pPreviousChunk.length - pPreviousChunk.bytesRead, m_FilePointer);
}
//读入对象的UV坐标
void ReadUVCoordinates(t3DObject pObject, tChunk pPreviousChunk)
{
//为了读入对象的UV坐标，首先需要读入数量，再读入具体的数据
//读入UV坐标的数量
pPreviousChunk.bytesRead += fread(ref pObject.numTexVertex, 2, m_FilePointer);
//初始化保存UV坐标的数组
pObject.pTexVerts = new CVector2[pObject.numTexVertex];
//读入纹理坐标
pPreviousChunk.bytesRead += fread(ref pObject.pTexVerts, pPreviousChunk.length - pPreviousChunk.bytesRead, m_FilePointer);
}
//处理所有的文件中的对象信息
void ProcessNextObjectChunk(t3DModel pModel, t3DObject pObject, tChunk pPreviousChunk)
{
m_CurrentChunk = new tChunk();
//继续读入块的内容直至本子块结束
while (pPreviousChunk.bytesRead < pPreviousChunk.length)
{
ReadChunk(m_CurrentChunk);
if (m_CurrentChunk.ID == FileHead.OBJECT_MESH)//正读入的是一个新块
{
//使用递归函数调用，处理该新块
ProcessNextObjectChunk(pModel, pObject, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.OBJECT_VERTICES)//读入的是对象顶点
{
ReadVertices(pObject, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.OBJECT_FACES)//读入的是对象的面
{
ReadVertexIndices(pObject, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.OBJECT_MATERIAL)//读入的是对象的材质名称
{
//该块保存了对象材质的名称，可能是一个颜色，也可能是一个纹理映射。
//同时在该块中也保存了纹理对象所赋予的面
//下面读入对象的材质名称
ReadObjectMaterial(pModel, pObject, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.OBJECT_UV)//读入对象的UV纹理坐标
{
ReadUVCoordinates(pObject, m_CurrentChunk);
}
else
{
//掠过不需要读入的块
while (m_CurrentChunk.bytesRead != m_CurrentChunk.length)
{
int[] b = new int[1];
m_CurrentChunk.bytesRead += fread(ref b, 1, m_FilePointer);
}
}
//添加从最后块中读入的字节数
pPreviousChunk.bytesRead += m_CurrentChunk.bytesRead;
}
//当前快设置为前面的块
m_CurrentChunk = pPreviousChunk;
}
//读入对象的顶点
void ReadVertices(t3DObject pObject, tChunk pPreviousChunk)
{
//在读入实际的顶点之前，首先必须确定需要读入多少个顶点。
//读入顶点的数目
pPreviousChunk.bytesRead += fread(ref pObject.numOfVerts, 2, m_FilePointer);
//分配顶点的储存空间，然后初始化结构体
pObject.pVerts = new CVector3[pObject.numOfVerts];
//读入顶点序列
pPreviousChunk.bytesRead += fread(ref pObject.pVerts, pPreviousChunk.length - pPreviousChunk.bytesRead, m_FilePointer);
//因为3DMax的模型Z轴是指向上的，将y轴和z轴翻转——y轴和z轴交换，再把z轴反向
//遍历所有的顶点
//for (int i = 0; i < pObject.numOfVerts; i++)
//{
// float fTempY = pObject.pVerts[i].y;
// pObject.pVerts[i].y = pObject.pVerts[i].z;
// pObject.pVerts[i].z = -1 * fTempY;
//}
}
//模型单位归一化
protected void LoadBox()
{
boxMax = new CVector3();
boxMin = new CVector3();
boxMax.x = float.MinValue;
boxMax.y = float.MinValue;
boxMax.z = float.MinValue;
boxMin.x = float.MaxValue;
boxMin.y = float.MaxValue;
boxMin.z = float.MaxValue;
//获取模型的边界值
for (int i = 0; i < model.numOfObjects; i++)
{
t3DObject pObject = model.pObject[i];
for (int j = 0; j < pObject.numOfVerts; j++)
{
float x = pObject.pVerts[j].x / 1000;
float y = pObject.pVerts[j].y / 1000;
float z = pObject.pVerts[j].z / 1000;
if (boxMin.x > x)
{
boxMin.x = x;
}
if (boxMin.y > y)
{
boxMin.y = y;
}
if (boxMin.z > z)
{
boxMin.z = z;
}
if (boxMax.x < x)
{
boxMax.x = x;
}
if (boxMax.y < y)
{
boxMax.y = y;
}
if (boxMax.z < z)
{
boxMax.z = z;
}
}
}
//计算模型的宽度、高度和深度
w = (boxMax.x - boxMin.x); // OutputAbs(boxMax.x) + OutputAbs(boxMin.x);
h = (boxMax.y - boxMin.y); // OutputAbs(boxMax.y) + OutputAbs(boxMin.y);
d = (boxMax.z - boxMin.z); // OutputAbs(boxMax.z) + OutputAbs(boxMin.z);
//计算模型的中心
cx = (boxMax.x + boxMin.x) / 2.0;
cy = (boxMax.y + boxMin.y) / 2.0;
cz = (boxMax.z + boxMin.z) / 2.0;
//计算归一化所需的缩放比例
scale = OutputMax(OutputMax(w, h), d);
scale = 4.0f / scale;//根据模型实际来决定
//导入模型的单位为mm，将单位转换为m
for (int i = 0; i < model.numOfObjects; i++)
{
t3DObject pObject = model.pObject[i];
for (int j = 0; j < pObject.numOfVerts; j++)
{
pObject.pVerts[j].x /= 1000;
pObject.pVerts[j].y /= 1000;
pObject.pVerts[j].z /= 1000;
//pObject.pVerts[j].x -= (float)cx;
//pObject.pVerts[j].y -= (float)cy;
//pObject.pVerts[j].z -= (float)cz;
}
}
}
//下面的这些函数主要用来计算顶点的法向量，顶点的法向量主要用来计算光照
//计算对象的法向量
private void ComputeNormals(t3DModel pModel)
{
CVector3 vVector1, vVector2, vNormal;
CVector3[] vPoly;
vPoly = new CVector3[3];
//如果模型中没有对象，则返回
if (pModel.numOfObjects <= 0)
{
return;
}
//遍历模型中所有的对象
for (int index = 0; index < pModel.numOfObjects; index++)
{
//获得当前对象
t3DObject pObject = pModel.pObject[index];
//分配需要的空间
CVector3[] pNormals = new CVector3[pObject.numOfFaces];
CVector3[] pTempNormals = new CVector3[pObject.numOfFaces];
pObject.pNormals = new CVector3[pObject.numOfVerts];
//遍历对象所有面
for (int i = 0; i < pObject.numOfFaces; i++)
{
vPoly[0] = pObject.pVerts[pObject.pFaces[i].vertIndex[0]];
vPoly[1] = pObject.pVerts[pObject.pFaces[i].vertIndex[1]];
vPoly[2] = pObject.pVerts[pObject.pFaces[i].vertIndex[2]];
//计算面的法向量
vVector1 = Vector(vPoly[0], vPoly[2]);
vVector2 = Vector(vPoly[2], vPoly[1]);
vNormal = Cross(vVector1, vVector2);
pTempNormals[i] = vNormal;
vNormal = Normalize(vNormal);
pNormals[i] = vNormal;
}
//下面求顶点的法向量:顶点法向量是以该点为顶点的所有三角形法向量之和
CVector3 vSum = new CVector3();
vSum.x = 0; vSum.y = 0; vSum.z = 0;
int shared = 0;
//遍历所有的顶点
for (int i = 0; i < pObject.numOfVerts; i++)
{
for (int j = 0; j < pObject.numOfFaces; j++)
{
if (pObject.pFaces[j].vertIndex[0] == i ||
pObject.pFaces[j].vertIndex[1] == i ||
pObject.pFaces[j].vertIndex[2] == i)
{
vSum = AddVector(vSum, pTempNormals[j]);
shared++;
}
}
pObject.pNormals[i] = DivideVectorByScaler(vSum, (float)(-1 * shared));
//规范化最后的顶点法向量
pObject.pNormals[i] = Normalize(pObject.pNormals[i]);
vSum.x = 0; vSum.y = 0; vSum.z = 0;
shared = 0;
}
}
}
//读出3ds文件的主要部分
void ProcessNextChunk(t3DModel pModel, tChunk pPreviousChunk)
{
t3DObject newObject = new t3DObject();
int version = 0;
m_CurrentChunk = new tChunk();
// 下面每读一个新块，都要判断一下块的ID，如果该块是需要的读入的，则继续进行
// 如果是不需要读入的块，则略过
// 继续读入子块，直到达到预定的长度
while (pPreviousChunk.bytesRead < pPreviousChunk.length)
{
//读入下一个块
ReadChunk(m_CurrentChunk);
//判断ID号
if (m_CurrentChunk.ID == FileHead.VERSION)
{
m_CurrentChunk.bytesRead += fread(ref version, m_CurrentChunk.length - m_CurrentChunk.bytesRead, m_FilePointer);
// 如果文件版本号大于3，给出一个警告信息
if (version > 3)
{
Debug.WriteLine("Warning: This 3DS file is over version 3 so it may load incorrectly");
}
}
else if (m_CurrentChunk.ID == FileHead.OBJECTINFO)
{
//读入下一个块
ReadChunk(m_TempChunk);
//获得网络的版本号
m_TempChunk.bytesRead += fread(ref version, m_TempChunk.length - m_TempChunk.bytesRead, m_FilePointer);
//增加读入的字节数
m_CurrentChunk.bytesRead += m_TempChunk.bytesRead;
//进入下一个块
ProcessNextChunk(pModel, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.MATERIAL)//材质信息
{
//材质的数目递增
pModel.numOfMaterials++;
//在纹理链表中添加一个空白纹理结构
pModel.pMaterials.Add(new tMaterialInfo());
//进入材质装入函数
ProcessNextMaterialChunk(pModel, m_CurrentChunk);
}
else if (m_CurrentChunk.ID == FileHead.OBJECT)//对象的名称
{
//对象数目递增
pModel.numOfObjects++;
//添加一个新的tObject节点到对象的链表中
pModel.pObject.Add(new t3DObject());
//获得并保存对象的名称，然后增加读入的字节数
m_CurrentChunk.bytesRead += getStr(ref pModel.pObject[pModel.numOfObjects - 1].strName);
//进入其余对象信息的读入
ProcessNextObjectChunk(pModel, pModel.pObject[pModel.numOfObjects - 1], m_CurrentChunk);
}
else
{
// 跳过关键帧块的读入，增加需要读入的字节数 EDITKEYFRAME
// 跳过所有忽略的块的内容的读入，增加需要读入的字节数
while (m_CurrentChunk.bytesRead != m_CurrentChunk.length)
{
int[] b = new int[1];
m_CurrentChunk.bytesRead += fread(ref b, 1, m_FilePointer);
}
}
//添加从最后块中读入的字节数
pPreviousChunk.bytesRead += m_CurrentChunk.bytesRead;
}
//当前快设置为前面的块
m_CurrentChunk = pPreviousChunk;
}
public void DrawModel() //画出模型
{
GL.glPushMatrix();
GL.glRotatef(270.0f, 1.0f, 0.0f, 0.0f);
GL.glEnable(GL.GL_BLEND);
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
GL.glDepthMask((byte)Traparent);
//画太阳
//画读入的模型
#region
for (int i = 0; i < this.model.numOfObjects; i++)
{
if (this.model.pObject.Count <= 0)
{
break;
}
t3DObject pObject = this.model.pObject[i];
// if (!floors.Contains(pObject.strName.Substring(1, 1))) continue;
if (pObject.bHasTexture)
{
GL.glEnable(GL.GL_TEXTURE_2D);
GL.glColor4ub(255, 255, 255, (byte)Transparency);
GL.glBindTexture(GL.GL_TEXTURE_2D, this.g_Texture[pObject.materialID]);
}
else
{
GL.glDisable(GL.GL_TEXTURE_2D);
GL.glColor3ub(255, 255, 255);
}
GL.glBegin(GL.GL_TRIANGLES);
for (int j = 0; j < pObject.numOfFaces; j++)
{
for (int whichVertex = 0; whichVertex < 3; whichVertex++)
{
int index = pObject.pFaces[j].vertIndex[whichVertex];
GL.glNormal3f(pObject.pNormals[index].x, pObject.pNormals[index].y, pObject.pNormals[index].z);
if (pObject.bHasTexture)
{
if (pObject.pTexVerts != null)
{
GL.glTexCoord2f(pObject.pTexVerts[index].x, pObject.pTexVerts[index].y);
}
}
else
{
if (this.model.pMaterials.Count != 0 && pObject.materialID >= 0)
{
int[] color = this.model.pMaterials[pObject.materialID].color;
GL.glColor3ub((byte)color[0], (byte)color[1], (byte)color[2]);
}
}
GL.glVertex3f(pObject.pVerts[index].x * (float)scale, pObject.pVerts[index].y * (float)scale, pObject.pVerts[index].z * (float)scale);
}
}
GL.glEnd();
GL.glDisable(GL.GL_TEXTURE_2D);
}
GL.glDisable(GL.GL_BLEND);
GL.glPopMatrix();
#endregion
}