[12] 扇形体(Fan)图形的生成算法
顶点数据的生成
bool YfBuildFunVertices
(
Yreal radius,
Yreal degree,
Yreal height,
Yuint slices,
YeOriginPose originPose,
Yuint vertexStriding,
Yuint vertexPos,
void* pVerticesBuffer
)
{
if (degree < || degree > || !pVerticesBuffer)
{
return false;
}
if (slices < || !pVerticesBuffer)
{
return false;
} Yuint numVertices = (slices + ) * ; 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;
} // 柱顶顶点赋值
{
nOffset = ;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = 0.0f;
curVertexPtr->y = height + originOffsetY;
curVertexPtr->z = 0.0f;
} // 柱底顶点赋值
{
nOffset = (numVertices - ) * vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = 0.0f;
curVertexPtr->y = originOffsetY;
curVertexPtr->z = 0.0f;
} Yreal radian = YD_DEGREE_TO_RADIAN(degree);
Yreal angleXZ;
Yreal posX, posZ;
for (Yuint i = ; i < slices; i++)
{
angleXZ = radian * i / (slices - );
posX = yf_sin(angleXZ);
posZ = yf_cos(angleXZ); // 上顶点
{
nOffset = ( + i) * vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = radius * posX;
curVertexPtr->y = height + originOffsetY;
curVertexPtr->z = radius * posZ;
} // 下顶点
{
nOffset = ( + slices + i) * vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = radius * posX;
curVertexPtr->y = originOffsetY;
curVertexPtr->z = radius * posZ;
}
} return true;
}
三角形索引数据的生成
bool YfBuildFunTriIndices
(
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;
} // 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++)
{
nOffset = (i * ) * indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = + i;
triIndexPtr->index2 = + i + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = numVertices - ;
triIndexPtr->index1 = + slices + i + ;
triIndexPtr->index2 = + slices + i; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = + i;
triIndexPtr->index1 = + slices + i;
triIndexPtr->index2 = + i + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = + i + ;
triIndexPtr->index1 = + slices + i;
triIndexPtr->index2 = + slices + i + ;
} nOffset = ((slices - ) * ) * indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = + slices; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = slices;
triIndexPtr->index2 = numVertices - ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = slices;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = numVertices - ;
}
else
{
YsTriIndex32* triIndexPtr = NULL;
for (Yuint i = ; i < slices - ; i++)
{
nOffset = (i * ) * indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = + i;
triIndexPtr->index2 = + i + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = numVertices - ;
triIndexPtr->index1 = + slices + i + ;
triIndexPtr->index2 = + slices + i; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = + i;
triIndexPtr->index1 = + slices + i;
triIndexPtr->index2 = + i + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = + i + ;
triIndexPtr->index1 = + slices + i;
triIndexPtr->index2 = + slices + i + ;
} nOffset = ((slices - ) * ) * indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = + slices; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = ;
triIndexPtr->index1 = slices;
triIndexPtr->index2 = numVertices - ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = slices;
triIndexPtr->index1 = numVertices - ;
triIndexPtr->index2 = numVertices - ;
} return true;
}
线框索引数据的生成
bool YfBuildFunWireIndices
(
Yuint slices,
YeIndexType indexType,
Yuint indexStriding,
Yuint indexPos,
void* pWireIndicesBuffer
)
{
if (slices < || !pWireIndicesBuffer)
{
return false;
} Yuint numVertices = (slices + ) * ;
Yuint numLines = slices + (slices-) * + ;
if (indexType == YE_INDEX_16_BIT &&
numVertices > YD_MAX_UNSIGNED_INT16)
{
return false;
} // 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++)
{
nOffset = (i * ) * indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = + i;
lineIndexPtr->index1 = + slices + i; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = + i;
lineIndexPtr->index1 = + i + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = + slices + i;
lineIndexPtr->index1 = + slices + i + ;
} nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = slices;
lineIndexPtr->index1 = *slices; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = *slices + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = slices; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = *slices + ;
lineIndexPtr->index1 = slices + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = *slices + ;
lineIndexPtr->index1 = *slices;
}
else
{
YsLineIndex32* lineIndexPtr = NULL;
for (Yuint i= ; i < slices; i++)
{
YsLineIndex32* lineIndexPtr = NULL;
for (Yuint i = ; i < slices - ; i++)
{
nOffset = (i * ) * indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = + i;
lineIndexPtr->index1 = + slices + i; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = + i;
lineIndexPtr->index1 = + i + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = + slices + i;
lineIndexPtr->index1 = + slices + i + ;
} nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = slices;
lineIndexPtr->index1 = *slices; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = *slices + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = ;
lineIndexPtr->index1 = slices; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = *slices + ;
lineIndexPtr->index1 = slices + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = *slices + ;
lineIndexPtr->index1 = *slices;
}
} return true;
}
[12] 扇形体(Fan)图形的生成算法的更多相关文章
- [20] 鼓状物(Drum)图形的生成算法
顶点数据的生成 bool YfBuildDrumVertices ( Yreal radius, Yreal assistRadius, Yuint slices, Yuint stacks, YeO ...
- [17] 楼梯(Stairs)图形的生成算法
感觉这图形怎么看怎么像搓衣板. 顶点数据的生成 bool YfBuildStairsVertices ( Yreal width, Yreal length, Yreal height, Yuint ...
- [19] 半球形(Hemisphere)图形的生成算法
顶点数据的生成 bool YfBuildHemisphereVertices ( Yreal radius, Yuint slices, Yuint stacks, YeOriginPose orig ...
- [18] 螺旋楼梯(Spiral Stairs)图形的生成算法
顶点数据的生成 bool YfBuildSpiralStairsVertices ( Yreal radius, Yreal assistRadius, Yreal height, Yuint sli ...
- [16] 螺旋面(Spire)图形的生成算法
顶点数据的生成 bool YfBuildSpireVertices ( Yreal radius, Yreal assistRadius, Yreal height, Yuint slices, Yu ...
- [15] 星星(Star)图形的生成算法
顶点数据的生成 bool YfBuildStarVertices ( Yreal radius, Yreal assistRadius, Yreal height, Yuint slices, YeO ...
- [14] 齿轮(Gear Wheel)图形的生成算法
顶点数据的生成 bool YfBuildGearwheelVertices ( Yreal radius, Yreal assistRadius, Yreal height, Yuint slices ...
- [13] 弧面(Arc)图形的生成算法
顶点数据的生成 bool YfBuildArcVertices ( Yreal radius, Yreal degree, Yreal height, Yuint slices, Yuint stac ...
- [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 ...
随机推荐
- jps出现process information unavailable的问题
jps出现process information unavailable(当然我ps -aux了,确定该进程是存在的),网上查找了原因,我的理解是这样: 因为jps的进程信息是存储在/tmp/hspe ...
- SQL注入备忘录
备忘录(一) 拿起小本本记下常考知识点. 常用连接词 and && %23%23 且 or || %7c%7c 或 xor 非 Access 数据库: 只能爆破表名.列名获取数据.无法 ...
- Linux-看完这篇Linux基本的操作就会了（转）
前言 只有光头才能变强 这个学期开了Linux的课程了,授课的老师也是比较负责任的一位.总的来说也算是比较系统地学习了一下Linux了~~~ 本文章主要是总结Linux的基础操作以及一些简单的概念~如 ...
- Highmaps网页图表教程之Highmaps第一个实例与图表构成
Highmaps网页图表教程之Highmaps第一个实例与图表构成 Highmaps第一个实例 下面我们来实现本教程的第一个Highmaps实例. [实例1-1:hellomap]下面来制作一个中国地 ...
- Python如何将RGB图像转换为Pytho灰度图像？
我正尝试使用matplotlib读取RGB图像并将其转换为灰度.在matlab中,我使用这个: 1 img = rgb2gray(imread('image.png')); 在matplotlib t ...
- 从Table 表中取出第 m 条到第 n 条的记录
* FROM Table id FROM Table )) --从TABLE表中取出第m到n条记录 (Exists版本) * FROM TABLE AS a WHERE Not Exists ( * ...
- bzoj 3105
感觉这题出得真好. 我们将问题简化过后是这样的: 给定一个数集,找一个最大的非空子集(一个集合的大小是它的元素和)A,使得A不存在一个非空子集,其所有元素的异或和为0. 因为我们始终可以只选一个数,所 ...
- LR监控Apache资源
前提本文使用的是lampp环境下自带的Apache服务 步骤1.修改Apache中Httpd.conf文件,添加如下代码:文件位置为:/opt/lampp/etc/httpd.conf,如下图: &l ...
- visio2013 激活工具，仅供交流学习
visio2013激活软件 环境是 win7, 64 bit 装了 visio 2013 , 可以却不能用它来画图,在网上找了一些破解工具,大都不能解决问题.网上不靠谱的广告型文章太多了 所幸,终于找 ...
- X-010 FriendlyARM tiny4412 uboot移植之移植网卡驱动TFTP用起来
<<<<<<<<<<<<<<<<<<<<<<<<< ...