paysages3d/src/render/software/VegetationModelRenderer.cpp

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#include "VegetationModelRenderer.h"
#include "Color.h"
#include "SurfaceMaterial.h"
#include "SpaceSegment.h"
#include "InfiniteRay.h"
#include "Disk.h"
#include "SoftwareRenderer.h"
#include "LightComponent.h"
#include "VegetationModelDefinition.h"
#include "VegetationResult.h"
VegetationModelRenderer::VegetationModelRenderer(SoftwareRenderer *parent, const VegetationModelDefinition *model)
: parent(parent), model(model) {
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}
VegetationModelRenderer::~VegetationModelRenderer() {
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}
VegetationResult VegetationModelRenderer::getResult(const SpaceSegment &segment, bool only_hit) const {
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InfiniteRay ray(segment.getStart(), segment.getDirection());
int intersections;
const SurfaceMaterial *material = &SurfaceMaterial::getDefault();
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bool hit = false;
Vector3 location, normal;
double distance, nearest, maximal;
maximal = segment.getLength();
nearest = maximal;
for (const auto &branch : model->getSolidVolumes()) {
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Vector3 near, far;
if (branch.findRayIntersection(ray, &near, &far)) {
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distance = ray.getCursor(near);
if (distance >= 0.0 and distance <= maximal) {
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// Got a branch hit
if (only_hit) {
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return VegetationResult(true);
}
if (distance < nearest) {
material = &model->getSolidMaterial();
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nearest = distance;
hit = true;
location = near;
normal = near.sub(branch.getAxis().getOrigin())
.crossProduct(branch.getAxis().getDirection())
.normalize();
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normal = branch.getAxis().getDirection().crossProduct(normal).normalize();
}
}
}
}
for (const auto &foliage : model->getFoliageGroups()) {
intersections = foliage.checkRayIntersection(ray);
if (intersections == 2) {
InfiniteRay subray(ray.getOrigin().sub(foliage.getCenter()).scale(1.0 / foliage.getRadius()),
ray.getDirection());
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for (const auto &leaf : model->getFoliageItems()) {
Sphere leafcap(leaf.getPoint(), leaf.getRadius() * leaf.getRadius() / foliage.getRadius());
// TODO Add cap intersection to Sphere class
Vector3 near, far;
if (leafcap.findRayIntersection(subray, &near, &far) == 2) {
if (near.sub(leaf.getPoint()).normalize().dotProduct(leaf.getNormal()) < 0.5) {
if (far.sub(leaf.getPoint()).normalize().dotProduct(leaf.getNormal()) < 0.5) {
continue;
} else {
near = far;
}
}
Vector3 capnormal = near.sub(leaf.getPoint()).normalize();
near = near.scale(foliage.getRadius()).add(foliage.getCenter());
distance = ray.getCursor(near);
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if (distance >= 0.0 and distance <= maximal) {
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// Got a foliage hit
if (only_hit) {
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return VegetationResult(true);
}
if (distance < nearest) {
material = &model->getFoliageMaterial();
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nearest = distance;
hit = true;
location = near;
normal = capnormal;
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if (normal.dotProduct(location.sub(segment.getStart())) > 0.0) {
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// We look at backside
normal = normal.scale(-1.0);
}
}
}
}
}
}
}
if (hit) {
return VegetationResult(location, normal, *material);
} else {
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return VegetationResult();
}
}
bool VegetationModelRenderer::applyLightFilter(LightComponent &light, const Vector3 &at) {
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return getResult(SpaceSegment(at, light.direction.scale(-2.0)), true).isHit();
}