54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
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#include "NightSky.h"
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#include "Color.h"
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#include "Vector3.h"
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#include "Geometry.h"
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NightSky::NightSky(SoftwareRenderer* renderer):
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renderer(renderer)
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{
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}
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NightSky::~NightSky()
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{
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}
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void NightSky::update()
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{
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}
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const Color NightSky::getColor(double altitude, const Vector3 &direction)
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{
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Color result(0.01, 0.012, 0.03);
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Vector3 location(0.0, altitude, 0.0);
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// Get stars
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// Get moon
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Vector3 moon_direction(0.3, 0.4, -0.3);
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moon_direction.normalize();
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if (moon_direction.dotProduct(direction) >= 0)
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{
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Vector3 moon_position = moon_direction.scale(100.0);
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double moon_radius = 1.0;
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Vector3 hit1, hit2;
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int hits = Geometry::rayIntersectSphere(location, direction, moon_position, moon_radius, &hit1, &hit2);
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if (hits > 1)
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{
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double dist = hit2.sub(hit1).getNorm() / moon_radius; // distance between intersection points (relative to radius)
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Color moon_color(0.3, 0.3, 0.3);
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if (dist <= 0.05)
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{
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moon_color.a *= 1.0 - dist / 0.05;
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}
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result.mask(moon_color);
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}
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}
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return result;
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}
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