[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;
}
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