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Make desired chunk level by distance calculation taking into account the chunks bounding height

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Erik Broberg
2016-06-13 18:32:50 -04:00
parent f850aa53e6
commit ebdb906adf
1 changed files with 6 additions and 2 deletions
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modules/globebrowsing/chunk/chunk.cpp
+6 -2
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@@ -133,15 +133,19 @@ namespace openspace {
Vec3 cameraPosition = data.camera.positionVec3();
Geodetic2 pointOnPatch = chunk.surfacePatch().closestPoint(
ellipsoid.cartesianToGeodetic2(cameraPosition));
Chunk::BoundingHeights heights = chunk.getBoundingHeights();
Vec3 globePosition = data.position.dvec3();
Vec3 patchPosition = globePosition + ellipsoid.cartesianSurfacePosition(pointOnPatch);
Vec3 cameraToChunk = patchPosition - cameraPosition;
// Calculate desired level based on distance
Scalar distance = glm::length(cameraToChunk);
Scalar distanceToPatch = glm::length(cameraToChunk);
Scalar distance = distanceToPatch - heights.min; // distance to actual minimum heights
Scalar scaleFactor = globe->lodScaleFactor * ellipsoid.minimumRadius();;
Scalar scaleFactor = globe->lodScaleFactor * ellipsoid.minimumRadius();
Scalar projectedScaleFactor = scaleFactor / distance;
int desiredLevel = ceil(log2(projectedScaleFactor));
return desiredLevel;