[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
- nginx一些细节知识点补充
1.upstream 配置代理 upstream local_tomcat { server localhost:8080; } server{ location / { proxy_pass htt ...
- 授权中的with admin option和with grant option
oracle: 当给一个用户授予系统权限时带上with admin option,他可以把此权限授予给其他用户.角色,而在revoke授予给这个用户的系统权限时不会级联回收他授予给其他用户的权限.如授 ...
- JAVAEE——宜立方商城13：订单系统实现、订单生成、Mycat数据库分片
1. 学习计划 1.订单系统实现 2.订单生成 3.Mycat数据库分片 2. 订单系统 2.1. 功能分析 1.在购物车页面点击“去结算”按钮,跳转到订单确认页面 a) 必须要求用户登录 b) 使用 ...
- [leetcode DP]62.Unique Paths
判断一个物体从左上角到右下角有多少种走法 class Solution(object): def uniquePaths(self, m, n): flag = [[1 for j in range( ...
- Swift2.0语言教程之类的嵌套与可选链接
Swift2.0语言教程之类的嵌套与可选链接 Swift2.0语言类的嵌套 在一个类中可以嵌套一个或者多个类.它们的嵌套形式也是不同的,大致分为了两种:直接嵌套和多次嵌套.下面依次讲解这两种方式. S ...
- splice() 的用法
splice splice()方法是修改Array的“万能方法”,它可以从指定的索引开始删除若干元素,然后再从该位置添加若干元素: var arr = ['Microsoft', 'Apple', ' ...
- 在Windows上安装FFmpeg程序
原文地址:http://helloway.blog.51cto.com/7666282/1642247 FFmpeg是一套可以用来记录.转换数字音频.视频,并能将其转化为流的开源计算机程序.它提供了录 ...
- mysql数据库外键删除更新规则
1.CASCADE:从父表删除或更新且自动删除或更新子表中匹配的行. 2.SET NULL:从父表删除或更新行,并设置子表中的外键列为NULL.如果使用该选项,必须保证子表列没有指定NOT NULL. ...
- 数据准备<5>:变量筛选-实战篇
在上一篇文章<数据准备<4>:变量筛选-理论篇>中,我们介绍了变量筛选的三种方法:基于经验的方法.基于统计的方法和基于机器学习的方法,本文将介绍后两种方法在Python(skl ...
- bzoj3456 城市规划 多项式求In
\(n\)个点的无向联通图的个数 打着好累啊 一定要封装一个板子 记\(C(x)\)为无向图个数的指数型生成函数,\(C(0) = 1\) 记\(G(x)\)为无向联通图个数的指数型生成函数,\(G( ...