Michaël Lemaire
a1a19dffeb
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@490 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
#include "private.h"
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#include <assert.h>
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#include <math.h>
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#include "../renderer.h"
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Color basicApplyAerialPerspective(Renderer* renderer, Vector3 location, Color base)
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{
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Vector3 direction = v3Sub(location, renderer->camera_location);
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double distance = v3Norm(direction);
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AtmosphereDefinition* definition = renderer->atmosphere->definition;
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double near = 10.0 - definition->humidity * 10.0;
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double far = 200.0 - definition->humidity * 180.0;
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double max = 0.75 + definition->humidity * 0.22;
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assert(near < far);
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if (distance < near)
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{
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return base;
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}
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else
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{
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if (distance > far)
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{
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distance = far;
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}
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double factor = (distance - near) / (far - near);
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/* TODO Get sky color without celestial objects (sun, stars...) */
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double angle = (1.0 - factor) * (1.0 - factor) * (1.0 - factor) * (1.0 - factor) * M_PI_4;
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direction = v3Normalize(direction);
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direction.y = sin(angle);
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Color sky = renderer->atmosphere->getSkyColor(renderer, v3Normalize(direction));
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sky.a = max * factor;
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colorMask(&base, &sky);
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return base;
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}
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}
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