Olympe::ViewportCulling Class Reference

Static helpers for AABB-based viewport culling. More...

#include <ViewportCulling.h>

Static Public Member Functions
static bool	IsNodeVisible (float nodeX, float nodeY, float nodeW, float nodeH, const ViewRect &viewport, float margin=50.0f)
	Tests whether a single node rectangle overlaps the viewport.
static std::vector< int >	FilterVisibleNodes (const std::vector< std::pair< int, ViewRect > > &nodeRects, const ViewRect &viewport, float margin=50.0f)
	Filters a list of (id, rect) pairs and returns only the visible IDs.

Detailed Description

Static helpers for AABB-based viewport culling.

Typical usage:

ViewRect vp = { scrollX, scrollY, windowW, windowH };
auto visible = ViewportCulling::FilterVisibleNodes(nodeRects, vp);
for (int id : visible) RenderNode(id);

Definition at line 54 of file ViewportCulling.h.

Member Function Documentation

FilterVisibleNodes()

std::vector< int > Olympe::ViewportCulling::FilterVisibleNodes ( const std::vector< std::pair< int, ViewRect > > &  nodeRects, const ViewRect &  viewport, float  margin = 50.0f  )

static

Filters a list of (id, rect) pairs and returns only the visible IDs.

Parameters

nodeRects	List of (nodeId, ViewRect) pairs.
viewport	Current visible rectangle in graph space.
margin	Extra padding applied to the viewport before testing.

Returns

IDs of visible nodes.

Definition at line 48 of file ViewportCulling.cpp.

References GetComponentTypeID_Static(), and IsNodeVisible().

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IsNodeVisible()

bool Olympe::ViewportCulling::IsNodeVisible ( float  nodeX, float  nodeY, float  nodeW, float  nodeH, const ViewRect &  viewport, float  margin = 50.0f  )

static

Tests whether a single node rectangle overlaps the viewport.

Parameters

nodeX	Node left edge in graph space.
nodeY	Node top edge in graph space.
nodeW	Node width.
nodeH	Node height.
viewport	Current visible rectangle in graph space.
margin	Extra padding applied to the viewport before testing.

Returns

true if the node is at least partially visible.

Definition at line 18 of file ViewportCulling.cpp.

References GetComponentTypeID_Static(), Olympe::ViewRect::h, Olympe::ViewRect::w, Olympe::ViewRect::x, and Olympe::ViewRect::y.

Referenced by FilterVisibleNodes().

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The documentation for this class was generated from the following files:

• Source/BlueprintEditor/Optimizations/ViewportCulling.h
• Source/BlueprintEditor/Optimizations/ViewportCulling.cpp