[10] 圆管(Pipe)图形的生成算法

顶点数据的生成

 bool                        YfBuildPipeVertices

 (

     Yreal                   radius,

     Yreal                   assistRadius,

     Yreal                   height,

     Yuint                   slices,

     YeOriginPose            originPose,

     Yuint                   vertexStriding,

     Yuint                   vertexPos,

     void*                   pVerticesBuffer

 )

 {

     if (slices <  || !pVerticesBuffer)

     {

         return false;

     }

     Yuint numVertices  = slices * ;

     // 顶点赋值

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

     YsVector3* curVertexPtr   = NULL;

     Yuint nOffset = ;

     Yreal originOffsetY = 0.0f;

     if (originPose == YE_ORIGIN_POSE_TOP)

     {

         originOffsetY = -height;

     }

     else if (originPose == YE_ORIGIN_POSE_CENTER)

     {

         originOffsetY = -height * 0.5f;

     }

     Yreal angleXZ;

     Yreal posX, posZ;

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

     {

         angleXZ = YD_REAL_TWAIN_PI * i / slices;

         posX = yf_sin(angleXZ);

         posZ = yf_cos(angleXZ);

         // 上顶点

         {

             // 外

             nOffset = (i * ) * vertexStriding;

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

             curVertexPtr->x = radius * posX;

             curVertexPtr->y = height + originOffsetY;

             curVertexPtr->z = radius * posZ;

             // 内

             nOffset += vertexStriding;

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

             curVertexPtr->x = assistRadius * posX;

             curVertexPtr->y = height + originOffsetY;

             curVertexPtr->z = assistRadius * posZ;

         }

         // 下顶点

         {

             // 外

             nOffset = (slices *  + i * ) * vertexStriding;

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

             curVertexPtr->x = radius * posX;

             curVertexPtr->y = originOffsetY;

             curVertexPtr->z = radius * posZ;

             // 内

             nOffset += vertexStriding;

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

             curVertexPtr->x = assistRadius * posX;

             curVertexPtr->y = originOffsetY;

             curVertexPtr->z = assistRadius * posZ;

         }

     }

     return true;

 }

三角形索引数据的生成

 bool                        YfBuildPipeTriIndices

 (

     Yuint                   slices,

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pTriIndicesBuffer

 )

 {

     if (slices <  || !pTriIndicesBuffer)

     {

         return false;

     }

     Yuint numVertices  = slices * ;

     Yuint numTriangles = slices * ;

     if (indexType == YE_INDEX_16_BIT &&

         numVertices > YD_MAX_UNSIGNED_INT16)

     {

         return false;

     }

     Yuint halfVtxNum = numVertices / ;

     // 索引赋值

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

     Yuint nOffset = ;

     if (indexType == YE_INDEX_16_BIT)

     {

         YsTriIndex16* triIndexPtr = NULL;

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

         {

             // 外面

             nOffset = (i * ) * indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = halfVtxNum + i * ;

             triIndexPtr->index2 = (i + ) % slices * ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = (i + ) % slices * ;

             triIndexPtr->index1 = halfVtxNum + i * ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices * ;

             // 里面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i *  + ;

             triIndexPtr->index1 = (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + i *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = (i + ) % slices *  + ;

             triIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + i *  + ;

             // 上面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = (i + ) % slices *  + ;

             triIndexPtr->index2 = i *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = (i + ) % slices * ;

             triIndexPtr->index2 = (i + ) % slices *  + ;

             // 下面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = halfVtxNum + i * ;

             triIndexPtr->index1 = halfVtxNum + i *  + ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = halfVtxNum + i * ;

             triIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices * ;

         }

     }

     else

     {

         YsTriIndex32* triIndexPtr = NULL;

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

         {

             // 外面

             nOffset = (i * ) * indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = halfVtxNum + i * ;

             triIndexPtr->index2 = (i + ) % slices * ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = (i + ) % slices * ;

             triIndexPtr->index1 = halfVtxNum + i * ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices * ;

             // 里面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i *  + ;

             triIndexPtr->index1 = (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + i *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = (i + ) % slices *  + ;

             triIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + i *  + ;

             // 上面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = (i + ) % slices *  + ;

             triIndexPtr->index2 = i *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = i * ;

             triIndexPtr->index1 = (i + ) % slices * ;

             triIndexPtr->index2 = (i + ) % slices *  + ;

             // 下面

             nOffset += indexStriding;

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

             triIndexPtr->index0 = halfVtxNum + i * ;

             triIndexPtr->index1 = halfVtxNum + i *  + ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices *  + ;

             nOffset += indexStriding;

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

             triIndexPtr->index0 = halfVtxNum + i * ;

             triIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

             triIndexPtr->index2 = halfVtxNum + (i + ) % slices * ;

         }

     }

     return true;

 }

线框索引数据的生成

 bool                        YfBuildPipeWireIndices

 (

     Yuint                   slices,

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pWireIndicesBuffer

 )

 {

     if (slices <  || !pWireIndicesBuffer)

     {

         return false;

     }

     Yuint numVertices = slices * ;

     Yuint numLines    = slices * ;

     if (indexType == YE_INDEX_16_BIT &&

         numVertices > YD_MAX_UNSIGNED_INT16)

     {

         return false;

     }

     Yuint halfVtxNum = numVertices / ;

     // 索引赋值

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

     Yuint nOffset = ;

     if (indexType == YE_INDEX_16_BIT)

     {

         YsLineIndex16* lineIndexPtr = NULL;

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

         {

             // 外面

             nOffset = (i * ) * indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = halfVtxNum + i * ;

             // 里面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i *  + ;

             lineIndexPtr->index1 = halfVtxNum + i *  + ;

             // 上面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = i *  + ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = (i + ) % slices * ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i *  + ;

             lineIndexPtr->index1 = (i + ) % slices *  + ;

             // 下面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i * ;

             lineIndexPtr->index1 = halfVtxNum + i *  + ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i * ;

             lineIndexPtr->index1 = halfVtxNum + (i + ) % slices * ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i *  + ;

             lineIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

         }

     }

     else

     {

         YsLineIndex32* lineIndexPtr = NULL;

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

         {

             // 外面

             nOffset = (i * ) * indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = halfVtxNum + i * ;

             // 里面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i *  + ;

             lineIndexPtr->index1 = halfVtxNum + i *  + ;

             // 上面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = i *  + ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i * ;

             lineIndexPtr->index1 = (i + ) % slices * ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = i *  + ;

             lineIndexPtr->index1 = (i + ) % slices *  + ;

             // 下面

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i * ;

             lineIndexPtr->index1 = halfVtxNum + i *  + ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i * ;

             lineIndexPtr->index1 = halfVtxNum + (i + ) % slices * ;

             nOffset += indexStriding;

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

             lineIndexPtr->index0 = halfVtxNum + i *  + ;

             lineIndexPtr->index1 = halfVtxNum + (i + ) % slices *  + ;

         }

     }

     return true;

 }

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[10] 圆管(Pipe)图形的生成算法

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