Scarfski/filament
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use the Jim Arvo method for transforming AABB's.

Browse Source 
This is from the 1990 Graphics Gems article.
This commit is contained in:
Philip Rideout
2019-10-30 11:33:03 -07:00
parent a82d93914e
commit fa108d6a65
5 changed files with 62 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
libs/gltfio/src/ResourceLoader.cpp
View File

@@ -642,23 +642,12 @@ void ResourceLoader::updateBoundingBoxes(details::FFilamentAsset* asset) const {
auto renderable = rm.getInstance(iter.second);
rm.setAxisAlignedBoundingBox(renderable, Box().set(aabb.min, aabb.max));
// Transform all eight corners of the bounding box to world space and find the new AABB.
// This is used for the asset-level bounding box.
// Transform this bounding box, then update the asset-level bounding box.
auto transformable = tm.getInstance(iter.second);
mat4f worldTransform = tm.getWorldTransform(transformable);
float3 a = (worldTransform * float4(aabb.min.x, aabb.min.y, aabb.min.z, 1.0)).xyz;
float3 b = (worldTransform * float4(aabb.min.x, aabb.min.y, aabb.max.z, 1.0)).xyz;
float3 c = (worldTransform * float4(aabb.min.x, aabb.max.y, aabb.min.z, 1.0)).xyz;
float3 d = (worldTransform * float4(aabb.min.x, aabb.max.y, aabb.max.z, 1.0)).xyz;
float3 e = (worldTransform * float4(aabb.max.x, aabb.min.y, aabb.min.z, 1.0)).xyz;
float3 f = (worldTransform * float4(aabb.max.x, aabb.min.y, aabb.max.z, 1.0)).xyz;
float3 g = (worldTransform * float4(aabb.max.x, aabb.max.y, aabb.min.z, 1.0)).xyz;
float3 h = (worldTransform * float4(aabb.max.x, aabb.max.y, aabb.max.z, 1.0)).xyz;
float3 minpt = min(min(min(min(min(min(min(a, b), c), d), e), f), g), h);
float3 maxpt = max(max(max(max(max(max(max(a, b), c), d), e), f), g), h);
assetBounds.min = min(assetBounds.min, minpt);
assetBounds.max = max(assetBounds.max, maxpt);
const mat4f worldTransform = tm.getWorldTransform(transformable);
const Aabb transformed = aabb.transform(worldTransform);
assetBounds.min = min(assetBounds.min, transformed.min);
assetBounds.max = max(assetBounds.max, transformed.max);
}
}