Some refactoring to prepare for work on moon rendering

Also added render test to check it

src/basics/FractalNoise.cpp

@@ -209,7 +209,8 @@ string FractalNoise::checkDistribution() {
     max = 0.0;
     mean = 0.0;
     for (int i = 0; i < samples; i++) {
-        val = getBase3d((random.genDouble() - 0.5) * 10.0, (random.genDouble() - 0.5) * 10.0, (random.genDouble() - 0.5) * 10.0);
+        val = getBase3d((random.genDouble() - 0.5) * 10.0, (random.genDouble() - 0.5) * 10.0,
+                        (random.genDouble() - 0.5) * 10.0);
         min = std::min(val, min);
         max = std::max(val, max);
         mean += val * factor;

src/definition/AtmosphereDefinition.cpp

@@ -8,6 +8,8 @@
 #include "GodRaysDefinition.h"
 #include "CelestialBodyDefinition.h"
 
+#define WORLD_SCALING 0.05
+
 AtmosphereDefinition::AtmosphereDefinition(DefinitionNode *parent)
     : DefinitionNode(parent, "atmosphere", "atmosphere") {
     model = ATMOSPHERE_MODEL_DISABLED;
@@ -102,7 +104,9 @@ void AtmosphereDefinition::applyPreset(AtmospherePreset preset, RandomGenerator
     sun_color.b = 0.9;
     sun_color.a = 1.0;
     sun->propRadius()->setValue(1.0);
-    moon->propRadius()->setValue(1.0);
+    sun->propDistance()->setValue(149597870.0 / WORLD_SCALING);
+    moon->propDistance()->setValue(384403.0 / WORLD_SCALING);
+    moon->propRadius()->setValue(1737.4 / WORLD_SCALING);
     moon->propPhi()->setValue(0.5);
     moon->propTheta()->setValue(0.3);
 

src/definition/CelestialBodyDefinition.cpp

@@ -3,16 +3,23 @@
 #include "Vector3.h"
 #include "FloatNode.h"
 
+static constexpr double WORLD_SCALING = 0.05;
+static constexpr double EARTH_RADIUS = 6360.0;
+static constexpr double EARTH_RADIUS_SCALED = EARTH_RADIUS / WORLD_SCALING;
+
 CelestialBodyDefinition::CelestialBodyDefinition(DefinitionNode *parent, const string &name)
     : DefinitionNode(parent, name) {
+    distance = new FloatNode(this, "distance");
     phi = new FloatNode(this, "phi");
     theta = new FloatNode(this, "theta");
     radius = new FloatNode(this, "radius");
 }
 
-Vector3 CelestialBodyDefinition::getDirection() const {
-    VectorSpherical spc = {1.0, theta->getValue(), -phi->getValue()};
+Vector3 CelestialBodyDefinition::getLocation(bool over_water) const {
+    VectorSpherical spc = {distance->getValue(), theta->getValue(), -phi->getValue()};
+    if (over_water) {
+        return Vector3(spc).sub(VECTOR_DOWN.scale(EARTH_RADIUS_SCALED));
+    } else {
         return Vector3(spc);
     }
-
-// VectorSpherical moon_location_s = {MOON_DISTANCE_SCALED, atmosphere->moon_theta, -atmosphere->moon_phi};
+}

src/definition/CelestialBodyDefinition.h

@@ -12,6 +12,9 @@ class DEFINITIONSHARED_EXPORT CelestialBodyDefinition : public DefinitionNode {
   public:
     CelestialBodyDefinition(DefinitionNode *parent, const string &name);
 
+    inline FloatNode *propDistance() const {
+        return distance;
+    }
     inline FloatNode *propPhi() const {
         return phi;
     }
@@ -23,11 +26,15 @@ class DEFINITIONSHARED_EXPORT CelestialBodyDefinition : public DefinitionNode {
     }
 
     /**
-     * Get the normalized direction toward the celestial body (from the center of the earth).
+     * Get the location of the celestial body.
+     *
+     * If "over_water" is true, the location is given in standard coordinates with y=0.0 as water,
+     * otherwise in regard to the earth center.
      */
-    Vector3 getDirection() const;
+    Vector3 getLocation(bool over_water = true) const;
 
   private:
+    FloatNode *distance;
     FloatNode *phi;
     FloatNode *theta;
     FloatNode *radius;

src/definition/TerrainDefinition.cpp

@@ -66,8 +66,7 @@ double TerrainDefinition::getGridHeight(int x, int z, bool with_painting) {
     return h;
 }
 
-double TerrainDefinition::getInterpolatedHeight(double x, double z, bool with_painting,
-                                                bool water_offset) {
+double TerrainDefinition::getInterpolatedHeight(double x, double z, bool with_painting, bool water_offset) {
     double h;
 
     if (!with_painting || !has_painting || !height_map->getInterpolatedValue(x, z, &h)) {

src/interface/commandline/tests.cpp

@@ -24,6 +24,7 @@
 #include "VegetationModelDefinition.h"
 #include "VegetationInstance.h"
 #include "VegetationRenderer.h"
+#include "CelestialBodyDefinition.h"
 #include "RayCastingResult.h"
 #include "OpenGLVegetationImpostor.h"
 #include "Texture2D.h"
@@ -413,10 +414,33 @@ static void testTextures() {
     }
 }
 
+static void testMoonRendering() {
+    Scenery scenery;
+    scenery.autoPreset(8);
+    scenery.getClouds()->clear();
+    scenery.getCamera()->setLocation(VECTOR_ZERO);
+    scenery.getCamera()->setTarget(scenery.getAtmosphere()->childMoon()->getLocation());
+    scenery.getCamera()->setFov(0.1);
+
+    SoftwareCanvasRenderer renderer(&scenery);
+    renderer.setSize(600, 600);
+    renderer.setQuality(0.1);
+    renderer.getGodRaysSampler()->setEnabled(false);
+    /*SkyRasterizer rasterizer(&renderer, renderer.getProgressHelper(), 0);
+    renderer.setSoloRasterizer(&rasterizer);*/
+
+    scenery.getAtmosphere()->setDayTime(17, 30);
+    startTestRender(&renderer, "moon", 0);
+
+    scenery.getAtmosphere()->setDayTime(23);
+    startTestRender(&renderer, "moon", 1);
+}
+
 void runTestSuite() {
     testNoise();
     testTextures();
     testGodRays();
+    testMoonRendering();
     testNearFrustum();
     testCloudsNearGround();
     testVegetationModels();

src/render/opengl/OpenGLSkybox.cpp

@@ -82,7 +82,7 @@ void OpenGLSkybox::nodeChanged(const DefinitionNode *node, const DefinitionDiff
     AtmosphereDefinition *newdef = renderer->getScenery()->getAtmosphere();
 
     if (node->getPath() == path_sun_phi or node->getPath() == path_sun_theta) {
-        Vector3 sun_direction = renderer->getAtmosphereRenderer()->getSunDirection(false);
+        Vector3 sun_direction = renderer->getAtmosphereRenderer()->getSunDirection();
         state->set("sunDirection", sun_direction);
 
         Color sun_color = newdef->sun_color;

src/render/software/AtmosphereModelBruneton.cpp

@@ -1097,7 +1097,7 @@ AtmosphereResult AtmosphereModelBruneton::getSkyColor(Vector3 eye, const Vector3
 }
 
 AtmosphereResult AtmosphereModelBruneton::applyAerialPerspective(Vector3 location, const Color &base) const {
-    Vector3 eye = parent->getCameraLocation(location);
+    Vector3 eye = parent->getCameraLocation();
     eye.y = max(eye.y, 0.0);
     location.y = max(location.y, 0.0);
     Vector3 sun_position = parent->getAtmosphereRenderer()->getSunDirection().scale(SUN_DISTANCE);
@@ -1105,7 +1105,7 @@ AtmosphereResult AtmosphereModelBruneton::applyAerialPerspective(Vector3 locatio
     Vector3 direction = location.sub(eye).scale(WORLD_SCALING);
     double t = direction.getNorm();
     if (t < 0.000001) {
-        direction = parent->getCameraDirection(location).scale(0.001 * WORLD_SCALING);
+        direction = parent->getCameraDirection().scale(0.001 * WORLD_SCALING);
         t = direction.getNorm();
     }
 

src/render/software/AtmosphereRenderer.cpp

@@ -87,8 +87,9 @@ AtmosphereResult BaseAtmosphereRenderer::getSkyColor(const Vector3 &) {
     return result;
 }
 
-Vector3 BaseAtmosphereRenderer::getSunDirection(bool) const {
-    return getDefinition()->childSun()->getDirection();
+Vector3 BaseAtmosphereRenderer::getSunDirection() const {
+    auto sun_location = getDefinition()->childSun()->getLocation();
+    return sun_location.sub(parent->getCameraLocation()).normalize();
 }
 
 bool BaseAtmosphereRenderer::getLightsAt(vector<LightComponent> &, const Vector3 &) const {
@@ -137,7 +138,7 @@ AtmosphereResult SoftwareBrunetonAtmosphereRenderer::getSkyColor(const Vector3 &
     Color base;
 
     definition = getDefinition();
-    camera_location = parent->getCameraLocation(VECTOR_ZERO);
+    camera_location = parent->getCameraLocation();
 
     sun_direction = getSunDirection();
     Vector3 direction_norm = direction.normalize();

src/render/software/AtmosphereRenderer.h

@@ -16,7 +16,7 @@ class BaseAtmosphereRenderer : public LightSource {
 
     virtual AtmosphereResult applyAerialPerspective(const Vector3 &location, const Color &base);
     virtual AtmosphereResult getSkyColor(const Vector3 &direction);
-    virtual Vector3 getSunDirection(bool cache = true) const;
+    virtual Vector3 getSunDirection() const;
 
     virtual bool getLightsAt(vector<LightComponent> &result, const Vector3 &location) const override;
 

src/render/software/CloudBasicLayerRenderer.cpp

@@ -65,7 +65,7 @@ int CloudBasicLayerRenderer::findSegments(BaseCloudsModel *model, const Vector3
 
     model->getDetailRange(&min_step, &max_step);
 
-    double distance = parent->getCameraLocation(start).sub(start).getNorm();
+    double distance = parent->getCameraLocation().sub(start).getNorm();
     render_precision = min_step + (max_step - min_step) * min(distance / (quality + 0.1), 100.0) * 0.01;
 
     segment_count = 0;

src/render/software/GodRaysSampler.cpp

@@ -38,7 +38,7 @@ GodRaysSampler::~GodRaysSampler() {
 }
 
 void GodRaysSampler::prepare(SoftwareRenderer *renderer) {
-    setCameraLocation(renderer->getCameraLocation(VECTOR_ZERO));
+    setCameraLocation(renderer->getCameraLocation());
     setLighting(renderer->getLightingManager());
     setAltitudes(renderer->getScenery()->getTerrain()->getHeightInfo().min_height,
                  renderer->getCloudsRenderer()->getHighestAltitude());

src/render/software/NightSky.cpp

@@ -13,12 +13,6 @@
 #include "CelestialBodyDefinition.h"
 #include "FloatNode.h"
 
-#define WORLD_SCALING 0.05
-#define MOON_DISTANCE 384403.0
-#define MOON_DISTANCE_SCALED (MOON_DISTANCE / WORLD_SCALING)
-#define MOON_RADIUS 1737.4
-#define MOON_RADIUS_SCALED (MOON_RADIUS / WORLD_SCALING)
-
 NightSky::NightSky(SoftwareRenderer *renderer) : renderer(renderer) {
 }
 
@@ -58,10 +52,11 @@ const Color NightSky::getColor(double altitude, const Vector3 &direction) {
     }
 
     // Get moon
-    Vector3 moon_direction = atmosphere->childMoon()->getDirection();
-    Vector3 moon_position = moon_direction.scale(MOON_DISTANCE_SCALED);
+    Vector3 moon_position = atmosphere->childMoon()->getLocation();
+    Vector3 moon_direction = moon_position.sub(renderer->getCameraLocation()).normalize();
     if (moon_direction.dotProduct(direction) >= 0) {
-        double moon_radius = MOON_RADIUS_SCALED * 5.0 * atmosphere->childMoon()->propRadius()->getValue();
+        // TODO Why need the multiplier ?
+        double moon_radius = atmosphere->childMoon()->propRadius()->getValue() * 5.0;
         Vector3 hit1, hit2;
         int hits = Geometry::rayIntersectSphere(location, direction, moon_position, moon_radius, &hit1, &hit2);
         if (hits > 1) {
@@ -84,13 +79,13 @@ const Color NightSky::getColor(double altitude, const Vector3 &direction) {
     return result;
 }
 
-bool NightSky::getLightsAt(vector<LightComponent> &result, const Vector3 &) const {
+bool NightSky::getLightsAt(vector<LightComponent> &result, const Vector3 &loc) const {
     LightComponent moon, sky;
 
     AtmosphereDefinition *atmosphere = renderer->getScenery()->getAtmosphere();
 
     moon.color = Color(0.03, 0.03, 0.03); // TODO take moon phase into account
-    moon.direction = atmosphere->childMoon()->getDirection().scale(-1.0);
+    moon.direction = loc.sub(atmosphere->childMoon()->getLocation()).normalize();
     moon.reflection = 0.2;
     moon.altered = 1;
 

src/render/software/SkyRasterizer.cpp

@@ -33,7 +33,7 @@ void SkyRasterizer::rasterizeToCanvas(CanvasPortion *canvas) {
     step_i = Maths::PI * 2.0 / to_double(res_i);
     step_j = Maths::PI / to_double(res_j);
 
-    camera_location = renderer->getCameraLocation(VECTOR_ZERO);
+    camera_location = renderer->getCameraLocation();
 
     for (j = 0; j < res_j; j++) {
         if (interrupted) {
@@ -77,7 +77,7 @@ Color SkyRasterizer::shadeFragment(const CanvasFragment &fragment, const CanvasF
     Vector3 camera_location, direction;
     Color result;
 
-    camera_location = renderer->getCameraLocation(location);
+    camera_location = renderer->getCameraLocation();
     direction = location.sub(camera_location);
 
     // TODO Don't compute sky color if it's fully covered by clouds

src/render/software/SoftwareRenderer.cpp

@@ -107,12 +107,12 @@ void SoftwareRenderer::setQuality(double quality) {
 
 Color SoftwareRenderer::applyLightingToSurface(const Vector3 &location, const Vector3 &normal,
                                                const SurfaceMaterial &material) {
-    return lighting->apply(getCameraLocation(location), location, normal, material);
+    return lighting->apply(getCameraLocation(), location, normal, material);
 }
 
 Color SoftwareRenderer::applyMediumTraversal(const Vector3 &location, const Color &color) {
     Color result = atmosphere_renderer->applyAerialPerspective(location, color).final;
-    result = clouds_renderer->getColor(getCameraLocation(location), location, result);
+    result = clouds_renderer->getColor(getCameraLocation(), location, result);
     return result;
 }
 
@@ -132,11 +132,11 @@ RayCastingResult SoftwareRenderer::rayWalking(const Vector3 &location, const Vec
     return result;
 }
 
-Vector3 SoftwareRenderer::getCameraLocation(const Vector3 &) {
+Vector3 SoftwareRenderer::getCameraLocation() {
     return render_camera->getLocation();
 }
 
-Vector3 SoftwareRenderer::getCameraDirection(const Vector3 &) {
+Vector3 SoftwareRenderer::getCameraDirection() {
     return render_camera->getDirectionNormalized();
 }
 

src/render/software/SoftwareRenderer.h

@@ -19,8 +19,8 @@ class SOFTWARESHARED_EXPORT SoftwareRenderer {
     int render_quality;
     CameraDefinition *render_camera;
 
-    virtual Vector3 getCameraLocation(const Vector3 &target);
-    virtual Vector3 getCameraDirection(const Vector3 &target);
+    virtual Vector3 getCameraLocation();
+    virtual Vector3 getCameraDirection();
     virtual double getPrecision(const Vector3 &location);
     virtual Vector3 projectPoint(const Vector3 &point);
     virtual Vector3 unprojectPoint(const Vector3 &point);

src/render/software/TerrainRasterizer.cpp

@@ -135,7 +135,7 @@ void TerrainRasterizer::getChunk(SoftwareRenderer *renderer, TerrainRasterizer::
 int TerrainRasterizer::performTessellation(CanvasPortion *canvas) {
     TerrainChunkInfo chunk;
     int chunk_factor, chunk_count, i, result;
-    Vector3 cam = renderer->getCameraLocation(VECTOR_ZERO);
+    Vector3 cam = renderer->getCameraLocation();
     double radius_int, radius_ext;
     double chunk_size;
 

src/render/software/TerrainRenderer.cpp

@@ -122,9 +122,9 @@ Color TerrainRenderer::getFinalColor(double x, double z, double precision) {
             i++;
         }
 
-        auto color = textures_renderer->getFinalComposition(textures_definition, parent->getLightingManager(),
-                                                            current.first, current.second, normal, precision,
-                                                            parent->getCameraLocation(top_location));
+        auto color =
+            textures_renderer->getFinalComposition(textures_definition, parent->getLightingManager(), current.first,
+                                                   current.second, normal, precision, parent->getCameraLocation());
 
         return parent->applyMediumTraversal(top_location, color);
     }

src/render/software/WaterRasterizer.cpp

@@ -53,7 +53,7 @@ void WaterRasterizer::setQuality(double factor) {
 
 int WaterRasterizer::performTessellation(CanvasPortion *canvas) {
     int chunk_factor, chunk_count, i, result;
-    Vector3 cam = renderer->getCameraLocation(VECTOR_ZERO);
+    Vector3 cam = renderer->getCameraLocation();
     double radius_int, radius_ext, chunk_size;
 
     result = 0;

src/render/software/WaterRenderer.cpp

@@ -166,7 +166,7 @@ WaterRenderer::WaterResult WaterRenderer::getResult(double x, double z) {
     }
 
     normal = _getNormal(definition, noise, location, detail);
-    look_direction = location.sub(parent->getCameraLocation(location)).normalize();
+    look_direction = location.sub(parent->getCameraLocation()).normalize();
 
     /* Reflection */
     if (reflection == 0.0) {