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43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
//
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// OctreeUtils.h
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// libraries/octree/src
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//
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// Created by Andrew Meadows 2016.03.04
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// Copyright 2016 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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#ifndef hifi_OctreeUtils_h
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#define hifi_OctreeUtils_h
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#include <NumericalConstants.h>
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#include "OctreeConstants.h"
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class AABox;
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class AACube;
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class QJsonDocument;
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/// renderAccuracy represents a floating point "visibility" of an object based on it's view from the camera. At a simple
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/// level it returns 0.0f for things that are so small for the current settings that they could not be visible.
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float calculateRenderAccuracy(const glm::vec3& position,
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const AABox& bounds,
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float octreeSizeScale = DEFAULT_OCTREE_SIZE_SCALE,
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int boundaryLevelAdjust = 0);
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float boundaryDistanceForRenderLevel(unsigned int renderLevel, float voxelSizeScale);
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float getPerspectiveAccuracyAngle(float octreeSizeScale, int boundaryLevelAdjust);
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float getOrthographicAccuracySize(float octreeSizeScale, int boundaryLevelAdjust);
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// MIN_ELEMENT_ANGULAR_DIAMETER = angular diameter of 1x1x1m cube at 400m = sqrt(3) / 400 = 0.0043301 radians ~= 0.25 degrees
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const float MIN_ELEMENT_ANGULAR_DIAMETER = 0.0043301f; // radians
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// NOTE: the entity bounding cube is larger than the smallest possible containing octree element by sqrt(3)
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const float MIN_ENTITY_ANGULAR_DIAMETER = MIN_ELEMENT_ANGULAR_DIAMETER * SQRT_THREE;
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const float MIN_VISIBLE_DISTANCE = 0.0001f; // helps avoid divide-by-zero check
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bool isAngularSizeBigEnough(glm::vec3 position, const AACube& cube, float lodScaleFactor, float minDiameter);
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#endif // hifi_OctreeUtils_h
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