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# NurbsEvaluator
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---
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A tool for evaluating multiple NURBS curve/surface points using the GPU.
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## Dependencies
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---
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+ **MSVC**
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+ CUDA 11.8.0
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## Usage
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---
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#### Nurbs曲线
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在构造函数中传入控制点向量和knots向量：
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```C++
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NurbsCurve::Evaluator nurbsCurveEvaluator(
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{
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{-1, 0, 0},
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{0, 1, 6},
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{1, 0, 4},
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{2, 0.5, 3},
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{3, 3, 1},
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{4, -5, 0}
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},
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{0, 0, 0, 0.1, 0.5, 0.8, 1, 1, 1}
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); // 6点控制，knots长度为9，degree为2的NURBS
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```
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设置是否需要输出GPU并行计算花费的时间（默认否）：
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```C++
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nurbsCurveEvaluator.setRecordTime(true);
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```
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开始计算
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```C++
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nurbsCurveEvaluator.calculate(5); // 在参数域采样5个点
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```
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#### Nurbs曲面
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曲面在构造函数中需要传入三层vector嵌套表示的二维点阵、u方向的knots向量、v方向的knots向量
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```C++
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NurbsSurface::Evaluator nurbsSurfaceEvaluator(
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{
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{{-1, 0, 0}, {0, 1, 6}, {1, 0, 4}, {2, 0.5, 3}, {3, 3, 1}, {4, -5, 0}},
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{{-2, 1, 1.2}, {1, 2, 3}, {2, 2, 3}, {-1, -0.3, 2}, {-1, 2, 0}, {7, -8, 2}},
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{{-3.4, 2, 3}, {2, 3, 0}, {4, 3, 7}, {-2, 0, -0.2}, {1, 1.7, 5}, {9, -10.3, 6}},
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{{-1.5, 3.2, 1}, {2.6, 7, -2}, {5, 0.8, 4.2}, {-4, 1, 4}, {2.1, 4, -2}, {11, -6, 4}},
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{{-0.2, 2, 0}, {5, 3, 2}, {5, 1.5, 1.4}, {-3, 2, 5}, {0.8, 1.3, 0}, {15, -2, 0.9}},
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{{3, 1.4, -1}, {6, 2, 4}, {-1, 0, -2}, {0, 2.8, 2}, {-0.5, 2, 1.2}, {7, -3, -2}}
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},
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{0, 0, 0, 0.1, 0.5, 0.8, 1, 1, 1},
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{0, 0, 0, 0.2, 0.7, 0.8, 1, 1, 1}
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);
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nurbsSurfaceEvaluator.setRecordTime(true);
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nurbsSurfaceEvaluator.calculate(3, 4); // 计算时需要传入u、v两个方向的采样数目
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```
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