birkeh/o3de
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ensure brute force ray intersection works (#1170)

Browse Source 
* ensure brute force ray intersection works in the same space as kd-tree intersection

* add additional tests for ray casts against meshes using brute force approach

* update api and add some additional test cases

* comment tidy-up and other small updates/fixes for ray intersection code

* fix issue with values at the end of a ray
This commit is contained in:
Tom Hulton-Harrop
2021-06-08 19:44:33 +01:00
committed by GitHub
parent 80f62d0523
commit dd95d2b02e
7 changed files with 279 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Gems/Atom/RPI/Code/Source/RPI.Public/Model/Model.cpp
+13 -8
View File
@@ -137,12 +137,12 @@ namespace AZ
return m_modelAsset;
}
bool Model::LocalRayIntersection(const AZ::Vector3& rayStart, const AZ::Vector3& dir, float& distance, AZ::Vector3& normal) const
bool Model::LocalRayIntersection(const AZ::Vector3& rayStart, const AZ::Vector3& rayDir, float& distanceNormalized, AZ::Vector3& normal) const
{
AZ_PROFILE_FUNCTION(Debug::ProfileCategory::AzRender);
float start;
float end;
const int result = Intersect::IntersectRayAABB2(rayStart, dir.GetReciprocal(), m_aabb, start, end);
const int result = Intersect::IntersectRayAABB2(rayStart, rayDir.GetReciprocal(), m_aabb, start, end);
if (Intersect::ISECT_RAY_AABB_NONE != result)
{
if (ModelAsset* modelAssetPtr = m_modelAsset.Get())
@@ -151,7 +151,7 @@ namespace AZ
AZ::Debug::Timer timer;
timer.Stamp();
#endif
const bool hit = modelAssetPtr->LocalRayIntersectionAgainstModel(rayStart, dir, distance, normal);
const bool hit = modelAssetPtr->LocalRayIntersectionAgainstModel(rayStart, rayDir, distanceNormalized, normal);
#if defined(AZ_RPI_PROFILE_RAYCASTING_AGAINST_MODELS)
if (hit)
{
@@ -166,8 +166,12 @@ namespace AZ
}
bool Model::RayIntersection(
const AZ::Transform& modelTransform, const AZ::Vector3& nonUniformScale, const AZ::Vector3& rayStart, const AZ::Vector3& dir,
float& distanceFactor, AZ::Vector3& normal) const
const AZ::Transform& modelTransform,
const AZ::Vector3& nonUniformScale,
const AZ::Vector3& rayStart,
const AZ::Vector3& rayDir,
float& distanceNormalized,
AZ::Vector3& normal) const
{
AZ_PROFILE_FUNCTION(Debug::ProfileCategory::AzRender);
const AZ::Vector3 clampedScale = nonUniformScale.GetMax(AZ::Vector3(AZ::MinTransformScale));
@@ -175,12 +179,13 @@ namespace AZ
const AZ::Transform inverseTM = modelTransform.GetInverse();
const AZ::Vector3 raySrcLocal = inverseTM.TransformPoint(rayStart) / clampedScale;
// Instead of just rotating 'dir' we need it to be scaled too, so that 'distanceFactor' will be in the target units rather than object local units.
const AZ::Vector3 rayDest = rayStart + dir;
// Instead of just rotating 'rayDir' we need it to be scaled too, so that 'distanceNormalized' will be in the target units rather
// than object local units.
const AZ::Vector3 rayDest = rayStart + rayDir;
const AZ::Vector3 rayDestLocal = inverseTM.TransformPoint(rayDest) / clampedScale;
const AZ::Vector3 rayDirLocal = rayDestLocal - raySrcLocal;
bool result = LocalRayIntersection(raySrcLocal, rayDirLocal, distanceFactor, normal);
const bool result = LocalRayIntersection(raySrcLocal, rayDirLocal, distanceNormalized, normal);
normal = (normal * clampedScale).GetNormalized();
return result;
}