Mike Balfour
c873ddac45
* [LYN-3099] Fix vegetation raycasts to use bounded ray queries instead of FLT_MAX. Raycasts with a distance of FLT_MAX sometimes overflowed deep in IntersectSegmentTriangleCCW, so it's better to have strict start/end positional queries. We have specific starts and ends anyways, so it's a safer approach anyways. This also adds support for Non-Uniform Scale for meshes, since it was clearly not working correctly in vegetation when testing various scaled meshes. * Addressed PR feedback
43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include "SurfaceData_precompiled.h"
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#include <SurfaceData/Utility/SurfaceDataUtility.h>
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#include <Atom/RPI.Reflect/Model/ModelAssetCreator.h>
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namespace SurfaceData
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{
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bool GetMeshRayIntersection(
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const AZ::RPI::ModelAsset& meshAsset, const AZ::Transform& meshTransform,
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const AZ::Transform& meshTransformInverse, const AZ::Vector3& nonUniformScale,
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const AZ::Vector3& rayStart, const AZ::Vector3& rayEnd,
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AZ::Vector3& outPosition, AZ::Vector3& outNormal)
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{
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AZ_PROFILE_FUNCTION(AZ::Debug::ProfileCategory::Entity);
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const AZ::Vector3 clampedScale = nonUniformScale.GetMax(AZ::Vector3(AZ::MinTransformScale));
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// Transform everything into model space
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const AZ::Vector3 rayStartLocal = meshTransformInverse.TransformPoint(rayStart) / clampedScale;
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const AZ::Vector3 rayEndLocal = meshTransformInverse.TransformPoint(rayEnd) / clampedScale;
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const AZ::Vector3 rayDirectionLocal = (rayEndLocal - rayStartLocal).GetNormalized();
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float distance = rayEndLocal.GetDistance(rayStartLocal);
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AZ::Vector3 normalLocal;
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if (meshAsset.LocalRayIntersectionAgainstModel(rayStartLocal, rayDirectionLocal, distance, normalLocal))
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{
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// Transform everything back to world space
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outPosition = meshTransform.TransformPoint((rayStartLocal + (rayDirectionLocal * distance)) * clampedScale);
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outNormal = meshTransform.TransformVector(normalLocal * clampedScale);
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return true;
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}
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return false;
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}
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}
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