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https://github.com/OpenSpace/OpenSpace.git
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0d03177d43
* Initial restructuring of the Globebrowsing branch * Update Ghoul repository Fix include guards * More cleanup * Split texttileprovider subclasses into separate files * Move TileProviders into namespace * Convert static class methods into free functions * Splitting tile subclasses into their own files Remove `using namespace` from header file * Split TileDataSet subclass into separate file Update SGCT reference * Move shader preprocessing data into internal class * More Globebrowsing cleanup * More cleanup Remove unused Convexhull class
105 lines
5.4 KiB
C++
105 lines
5.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2017 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#include <modules/globebrowsing/chunk/culling/horizonculler.h>
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#include <modules/globebrowsing/chunk/chunk.h>
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#include <modules/globebrowsing/globes/renderableglobe.h>
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namespace openspace {
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namespace globebrowsing {
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namespace culling {
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bool HorizonCuller::isCullable(const Chunk& chunk, const RenderData& data) {
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// Calculations are done in the reference frame of the globe. Hence, the camera
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// position needs to be transformed with the inverse model matrix
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glm::dmat4 inverseModelTransform = chunk.owner().inverseModelTransform();
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const Ellipsoid& ellipsoid = chunk.owner().ellipsoid();
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const GeodeticPatch& patch = chunk.surfacePatch();
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float maxHeight = chunk.getBoundingHeights().max;
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glm::dvec3 globePosition = glm::dvec3(0,0,0); // In model space it is 0
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double minimumGlobeRadius = ellipsoid.minimumRadius();
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glm::dvec3 cameraPosition =
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glm::dvec3(inverseModelTransform * glm::dvec4(data.camera.positionVec3(), 1));
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glm::dvec3 globeToCamera = cameraPosition;
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Geodetic2 cameraPositionOnGlobe =
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ellipsoid.cartesianToGeodetic2(globeToCamera);
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Geodetic2 closestPatchPoint = patch.closestPoint(cameraPositionOnGlobe);
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glm::dvec3 objectPosition = ellipsoid.cartesianSurfacePosition(closestPatchPoint);
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// objectPosition is closest in latlon space but not guaranteed to be closest in
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// castesian coordinates. Therefore we compare it to the corners and pick the
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// real closest point,
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glm::dvec3 corners[4];
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corners[0] = ellipsoid.cartesianSurfacePosition(
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chunk.surfacePatch().getCorner(NORTH_WEST));
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corners[1] = ellipsoid.cartesianSurfacePosition(
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chunk.surfacePatch().getCorner(NORTH_EAST));
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corners[2] = ellipsoid.cartesianSurfacePosition(
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chunk.surfacePatch().getCorner(SOUTH_WEST));
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corners[3] = ellipsoid.cartesianSurfacePosition(
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chunk.surfacePatch().getCorner(SOUTH_EAST));
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for (int i = 0; i < 4; ++i) {
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float distance = glm::length(cameraPosition - corners[i]);
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if (distance < glm::length(cameraPosition - objectPosition)) {
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objectPosition = corners[i];
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}
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}
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return isCullable(cameraPosition, globePosition, objectPosition,
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maxHeight, minimumGlobeRadius);
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}
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bool HorizonCuller::isCullable(const glm::dvec3& cameraPosition,
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const glm::dvec3& globePosition,
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const glm::dvec3& objectPosition,
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double objectBoundingSphereRadius,
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double minimumGlobeRadius)
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{
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double distanceToHorizon =
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sqrt(pow(length(cameraPosition - globePosition), 2) -
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pow(minimumGlobeRadius, 2));
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double minimumAllowedDistanceToObjectFromHorizon = sqrt(
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pow(length(objectPosition - globePosition), 2) -
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pow(minimumGlobeRadius - objectBoundingSphereRadius, 2));
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// Minimum allowed for the object to be occluded
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double minimumAllowedDistanceToObjectSquared =
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pow(distanceToHorizon + minimumAllowedDistanceToObjectFromHorizon, 2)
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+ pow(objectBoundingSphereRadius, 2);
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double distanceToObjectSquared = pow(length(objectPosition - cameraPosition), 2);
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return distanceToObjectSquared > minimumAllowedDistanceToObjectSquared;
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}
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} // namespace culling
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} // namespace globebrowsing
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} // namespace openspace
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