30 lines
1.2 KiB
C++
30 lines
1.2 KiB
C++
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// Copyright 2020-2024 CesiumGS, Inc. and Contributors
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#include "CesiumTransforms.h"
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const double CesiumTransforms::metersToCentimeters = 100.0;
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const double CesiumTransforms::centimetersToMeters = 0.01;
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// Scale Cesium's meters up to Unreal's centimeters.
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const glm::dmat4x4 CesiumTransforms::scaleToUnrealWorld =
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glm::dmat4x4(glm::dmat3x3(metersToCentimeters));
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// Scale down Unreal's centimeters into Cesium's meters.
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const glm::dmat4x4 CesiumTransforms::scaleToCesium =
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glm::dmat4x4(glm::dmat3x3(centimetersToMeters));
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// We're initializing with a static function instead of inline to avoid an
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// internal compiler error in MSVC v14.27.29110.
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static glm::dmat4 createUnrealToOrFromCesium() {
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return glm::dmat4x4(
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glm::dvec4(1.0, 0.0, 0.0, 0.0),
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glm::dvec4(0.0, -1.0, 0.0, 0.0),
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glm::dvec4(0.0, 0.0, 1.0, 0.0),
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glm::dvec4(0.0, 0.0, 0.0, 1.0));
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}
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// Transform Cesium's right-handed, Z-up coordinate system to Unreal's
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// left-handed, Z-up coordinate system by inverting the Y coordinate. This same
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// transformation can also go the other way.
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const glm::dmat4x4 CesiumTransforms::unrealToOrFromCesium =
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createUnrealToOrFromCesium();
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