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Experiment on simplified LoH

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Another try of camera model for horizon
This commit is contained in:
JackCarterSmith 2024-12-14 19:01:28 +01:00
parent 2854da4053
commit 6e7b980096
Signed by: JackCarterSmith
GPG Key ID: 832E52F4E23F8F24
1 changed files with 32 additions and 17 deletions
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49
Engine/Graphics/3DRenderer.cpp
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@ -31,14 +31,12 @@
static bool VertexClipTest(M3D_F4& V, sf::Vector2f& RTsize, float gb_factor);
Graphic3DRenderer::Graphic3DRenderer() {
mRTSize = {1280.f, 324.f};
if (mMainCamera == nullptr) {
mMainCamera = std::make_unique<Camera>();
mMainCamera->SetPosition(0.0f, 1.5f, -8.0f);
mMainCamera->SetFrustrum(75.0f, mRTSize.x/mRTSize.y, 1.0f, 100.f);
mMainCamera->UpdateCamView();
}
SetRTSize(1280.f, 324.f);
mMainCamera->UpdateCamView();
// Fill world object list to render
mRenderList.clear();
@ -60,7 +58,7 @@ Graphic3DRenderer::~Graphic3DRenderer() {}
void Graphic3DRenderer::SetRTSize(unsigned int w, unsigned int h) {
mRTSize.x = w; mRTSize.y = h;
mMainCamera->SetFrustrum(90.0f, mRTSize.x/mRTSize.y, 1.0f, 100.f);
mMainCamera->SetFrustrum(75.0f, mRTSize.x/mRTSize.y, 1.0f, 100.f);
}
void Graphic3DRenderer::UpdateCamera(CAMERA_MOVE type, const float value) {
@ -126,10 +124,10 @@ void Graphic3DRenderer::Draw(sf::RenderTexture& context) {
const float sgRatio = ComputeSGRatio();
sf::RectangleShape gndRect;
if (mMainCamera->GetPos3f().y >= 0) {
gndRect.setSize(sf::Vector2f(1280, mRTSize.y * (1.f - sgRatio)));
gndRect.setPosition(sf::Vector2f(0, mRTSize.y * sgRatio));
gndRect.setSize(sf::Vector2f(mRTSize.x, mRTSize.y * sgRatio));
gndRect.setPosition(sf::Vector2f(0, mRTSize.y * (1.f - sgRatio)));
} else {
gndRect.setSize(sf::Vector2f(1280, mRTSize.y * sgRatio));
gndRect.setSize(sf::Vector2f(mRTSize.x, mRTSize.y * (1.f - sgRatio)));
gndRect.setPosition(sf::Vector2f(0, 0));
}
gndRect.setFillColor(sf::Color::Green);
@ -233,20 +231,37 @@ void Graphic3DRenderer::UpdateInternalTestObjects() {
mRenderList[2]->SetRotation(thetaAngle3, 0.f, thetaAngle3 * 0.5f);
mRenderList[3]->SetRotation(0.f, thetaAngle, 0.f);
}
#include <iostream>
// Compute the screen ratio between the ground and the sky (aka. Line of Horizon)
inline float Graphic3DRenderer::ComputeSGRatio() {
// FoV angle for Y axis is recovered using frustrum FoV and apply RT screen ratio to it
const float fovYAngle = M3D_Deg2Rad(mMainCamera->GetFoV() * (mRTSize.y/mRTSize.x));
//const double fovYAngleDiv2 = M3D_Deg2Rad(mMainCamera->GetFoV() * mRTSize.y / mRTSize.x) * 0.5f;
const double fovYAngle = M3D_Deg2Rad(mMainCamera->GetFoV()) * mRTSize.y / mRTSize.x;
// Get the camera pitch angle over camera FoV ratio
float sgRatio = M3D_ScalarASinEst(mMainCamera->GetLook3f().y) / fovYAngle;
//const float theta = M3D_ScalarASin(-mMainCamera->GetLook3f().y) * (fovYAngleDiv2 + 0.2047198f) / M3D_PIDIV2;
const float theta = M3D_ScalarASin(-mMainCamera->GetLook3f().y);
// Clamp and re-scale
if (sgRatio > M3D_PIDIV2)
sgRatio = M3D_PIDIV2;
else if (sgRatio < -M3D_PIDIV2)
sgRatio = -M3D_PIDIV2;
// Simple approach, real (infinite) horizon (w/o camera height and far screen calculation)
double sgRatio = 0.5f + std::tan(((theta / M3D_PI) / fovYAngle) * M3D_PIDIV4);
std::cout << (theta / M3D_PI) << ' ' << fovYAngle << ' ' << sgRatio << std::endl;
// Finite ground (to far plan), camera height impact the ground "level" -- KEEP FOR FURTHER USE
/*double sgRatio = -(mMainCamera->GetPos3f().y * 0.1f * M3D_ScalarCos(fovYAngleDiv2) - 101.f * M3D_ScalarSin(fovYAngleDiv2 + theta))
/ (2.f * 101.f * M3D_ScalarSin(fovYAngleDiv2) * M3D_ScalarCos(theta));
std::cout << fovYAngleDiv2 << ' ' << theta << ' ' << sgRatio << std::endl;*/
/*double p0 = 101.f / M3D_ScalarCos(fovYAngleDiv2);
double pf = mMainCamera->GetPos3f().y * 0.1f / M3D_ScalarSin(theta+fovYAngleDiv2);
double gh = (std::abs(p0 - pf) * M3D_ScalarSin(theta+fovYAngleDiv2)) / M3D_ScalarCos(theta);
double sh = 2.f * 101.f * std::tan(fovYAngleDiv2);
double sgRatio = gh / sh;
std::cout << fovYAngleDiv2 << ' ' << theta << " p0:" << p0 << " pf:" << pf << " gh:" << gh << " sh:" << sh << ' ' << sgRatio << std::endl;*/
return ((sgRatio - M3D_PIDIV2) / M3D_PI) + 1.f;
// Clamp
if (sgRatio > 1.f)
sgRatio = 1.f;
else if (sgRatio < 0.f)
sgRatio = 0.f;
return sgRatio;
}
inline static bool VertexClipTest(M3D_F4& V, sf::Vector2f& RTsize, float gb_factor) {