feat: Geometry clipTriangle unit test
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#include "CesiumGeometry/clipTriangleAtAxisAlignedThreshold.h"
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#include "catch2/catch.hpp"
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using namespace CesiumGeometry;
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TEST_CASE("clipTriangleAtAxisAlignedThreshold") {
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struct TestCase {
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double threshold;
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bool keepAbove;
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int i0;
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int i1;
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int i2;
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double u0;
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double u1;
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double u2;
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std::vector<TriangleClipVertex> calculatedResult;
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std::vector<TriangleClipVertex> expectedResult;
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};
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auto testCase = GENERATE(
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// eliminates a triangle that is entirely on the wrong side of the
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// threshold
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TestCase{0.1, false, 0, 1, 2, 0.2, 0.3, 0.4, {}, {}},
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// keeps a triangle that is entirely on the correct side of the threshold
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TestCase{0.1, true, 0, 1, 2, 0.2, 0.3, 0.4, {}, {0, 1, 2}},
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// adds two vertices on threshold when point 0 is on the wrong side and
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// above
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.6,
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0.4,
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0.2,
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{},
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{1,
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2,
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InterpolatedVertex{0, 2, 0.25},
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InterpolatedVertex{0, 1, 0.5}}},
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// adds two vertices on threshold when point 0 is on the wrong side and
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// below
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.4,
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0.6,
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0.8,
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{},
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{1,
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2,
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InterpolatedVertex{0, 2, 0.25},
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InterpolatedVertex{0, 1, 0.5}}},
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// adds two vertices on threshold when point 1 is on the wrong side and
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// above
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.2,
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0.6,
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0.4,
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{},
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{2,
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0,
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InterpolatedVertex{1, 0, 0.25},
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InterpolatedVertex{1, 2, 0.5}}},
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// adds two vertices on threshold when point 1 is on the wrong side and
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// below
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.8,
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0.4,
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0.6,
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{},
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{2,
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0,
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InterpolatedVertex{1, 0, 0.25},
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InterpolatedVertex{1, 2, 0.5}}},
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// adds two vertices on threshold when point 2 is on the wrong side and
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// above
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.4,
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0.2,
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0.6,
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{},
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{0,
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1,
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InterpolatedVertex{2, 1, 0.25},
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InterpolatedVertex{2, 0, 0.5}}},
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// adds two vertices on threshold when point 2 is on the wrong side and
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// below
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.6,
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0.8,
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0.4,
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{},
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{0,
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1,
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InterpolatedVertex{2, 1, 0.25},
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InterpolatedVertex{2, 0, 0.5}}},
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// adds two vertices on threshold when point 1 is on the wrong side and
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// below
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.8,
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0.4,
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0.6,
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{},
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{2,
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0,
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InterpolatedVertex{1, 0, 0.25},
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InterpolatedVertex{1, 2, 0.5}}},
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// adds two vertices on threshold when only point 0 is on the right side
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// and below
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.4,
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0.6,
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0.8,
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{},
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{0, InterpolatedVertex{1, 0, 0.5}, InterpolatedVertex{2, 0, 0.75}}},
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// adds two vertices on threshold when only point 0 is on the right side
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// and above
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.6,
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0.4,
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0.2,
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{},
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{0, InterpolatedVertex{1, 0, 0.5}, InterpolatedVertex{2, 0, 0.75}}},
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// adds two vertices on threshold when only point 1 is on the right side
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// and below
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.8,
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0.4,
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0.6,
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{},
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{1, InterpolatedVertex{2, 1, 0.5}, InterpolatedVertex{0, 1, 0.75}}},
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// adds two vertices on threshold when only point 1 is on the right side
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// and above
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.2,
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0.6,
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0.4,
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{},
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{1, InterpolatedVertex{2, 1, 0.5}, InterpolatedVertex{0, 1, 0.75}}},
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// adds two vertices on threshold when only point 2 is on the right side
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// and below
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TestCase{
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0.5,
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false,
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0,
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1,
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2,
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0.6,
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0.8,
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0.4,
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{},
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{2, InterpolatedVertex{0, 2, 0.5}, InterpolatedVertex{1, 2, 0.75}}},
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// adds two vertices on threshold when only point 2 is on the right side
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// and above
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TestCase{
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0.5,
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true,
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0,
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1,
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2,
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0.4,
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0.2,
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0.6,
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{},
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{2, InterpolatedVertex{0, 2, 0.5}, InterpolatedVertex{1, 2, 0.75}}});
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clipTriangleAtAxisAlignedThreshold(
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testCase.threshold,
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testCase.keepAbove,
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testCase.i0,
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testCase.i1,
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testCase.i2,
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testCase.u0,
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testCase.u1,
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testCase.u2,
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testCase.calculatedResult);
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CHECK(testCase.calculatedResult == testCase.expectedResult);
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}
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