sfeng/ray-tracer-comp371
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use fov to calc viewport height

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This commit is contained in:
Shuo Feng 2024-02-19 15:54:43 -05:00
parent e4e2d26a16
commit ffaf3aa450
Signed by: sfeng
GPG key ID: 1E83AE6CD1C037B1
1 changed files with 5 additions and 1 deletions
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6
src/RayTracer.cc
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@ -3,6 +3,7 @@
#include "Parser.h"
#include "Ray.h"
#include <Eigen/src/Core/Matrix.h>
#include <cmath>
void RayTracer::parse() {
for (auto i = json["output"].begin(); i != json["output"].end(); ++i)
@ -18,7 +19,10 @@ void RayTracer::parse() {
Ray getRay(int x, int y, const Vector3f &camPos, const Vector3f &lookat,
float fov, int width, int height) {
// TODO: compute ray
float viewportHeight = 2.0f;
float focalLength = lookat.norm();
float theta = fov / 180 * 3.14159;
float h = tan(theta / 2);
float viewportHeight = 2 * h * focalLength;
float viewportWidth = viewportHeight * width / height;
Vector3f viewportU = Vector3f(viewportWidth, 0, 0);
Vector3f viewportV = Vector3f(0, -viewportHeight, 0);