[11] 楔形体(Wedge)图形的生成算法

顶点数据的生成

 bool                        YfBuildWedgeVertices

 (

     Yreal                   width,

     Yreal                   length,

     Yreal                   height,

     YeOriginPose            originPose,

     Yuint                   vertexStriding,

     Yuint                   vertexPos,

     void*                   pVerticesBuffer

 )

 {

     if (!pVerticesBuffer)

     {

         return false;

     }

     Yuint numVertices  = ;

     // 顶点赋值

     char* vertexPtr = (char*)pVerticesBuffer + vertexPos;

     YsVector3* curVertexPtr   = NULL;

     Yuint nOffset = ;

     YsVector3 vOriginOffset(-width / , -height / , -length / );

     if (originPose == YE_ORIGIN_POSE_TOP)

     {

         vOriginOffset.y = -height;

     }

     else if (originPose == YE_ORIGIN_POSE_BOTTOM)

     {

         vOriginOffset.y = 0.0f;

     }

     // 底四个顶点

     for (Yuint j = ; j < ; j++)

     {

         for (Yuint i = ; i < ; i++)

         {

             nOffset = (j* + i) * vertexStriding;

             curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

             curVertexPtr->x = width*i + vOriginOffset.x;

             curVertexPtr->y = vOriginOffset.y;

             curVertexPtr->z = length*j + vOriginOffset.z;

         }

     }

     // 上顶点

     nOffset =  * vertexStriding;

     if (vertexPtr)

     {

         curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

         curVertexPtr->x = vOriginOffset.x + width / ;

         curVertexPtr->y = height + vOriginOffset.y;

         curVertexPtr->z = vOriginOffset.z;

         curVertexPtr = (YsVector3*)(vertexPtr + nOffset + vertexStriding);

         curVertexPtr->x = vOriginOffset.x + width / ;

         curVertexPtr->y = height + vOriginOffset.y;

         curVertexPtr->z = length + vOriginOffset.z;

     }

     return true;

 }     

三角形索引数据的生成

 bool                        YfBuildWedgeTriIndices

 (

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pTriIndicesBuffer

 )

 {

     if (!pTriIndicesBuffer)

     {

         return false;

     }

     char* indexPtr = (char*)pTriIndicesBuffer + indexPos;

     if (indexType == YE_INDEX_16_BIT)

     {

         YsTriIndex16* triIndexPtr = NULL;

         // bottom

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         // 4 face

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         // 2 face

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex16*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

     }

     else

     {

         YsTriIndex32* triIndexPtr = NULL;

         // bottom

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         // 4 face

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         // 2 face

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

         triIndexPtr = (YsTriIndex32*)(indexPtr + *indexStriding);

         triIndexPtr->index0 = ; triIndexPtr->index1 = ; triIndexPtr->index2 = ;

     }

     return true;

 }   

线框索引数据的生成

 bool                        YfBuildWedgeWireIndices

 (

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pWireIndicesBuffer

 )

 {

     if (!pWireIndicesBuffer)

     {

         return false;

     }

     Yuint numVertices = ;

     Yuint numLines    = ;

     // 索引赋值

     char* indexPtr = (char*)pWireIndicesBuffer + indexPos;

     Yuint nOffset = ;

     if (indexType == YE_INDEX_16_BIT)

     {

         YsLineIndex16* lineIndexPtr = NULL;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

     }

     else

     {

         YsLineIndex32* lineIndexPtr = NULL;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset =  * indexStriding;

         lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

     }

     return true;

 }