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Add possibility to play with focal length and aperture to the camera. Not enabled by default.

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Godzil
2020-03-17 00:23:16 +00:00
parent 9849c16f66
commit 61ce9d3543
4 changed files with 36 additions and 9 deletions
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31
source/camera.cpp
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@@ -15,10 +15,11 @@
#include <stdio.h>
#include <renderstat.h>
Camera::Camera(uint32_t hsize, uint32_t vsize, double fov) : verticalSize(vsize), horizontalSize(hsize), fieldOfView(fov)
Camera::Camera(uint32_t hsize, uint32_t vsize, double fov, double focal, double aperture, uint32_t rayCount) : verticalSize(vsize),
horizontalSize(hsize), fieldOfView(fov), focalDistance(focal), apertureSize(aperture), rayCount(rayCount)
{
double aspectRatio = (double)hsize / (double)vsize;
double halfView = tan(fov / 2.0);
double halfView = tan(fov / 2.0) * this->focalDistance;
if (aspectRatio >= 1)
{
@@ -42,7 +43,7 @@ void Camera::setTransform(Matrix transform)
this->inverseTransform = transform.inverse();
}
Ray Camera::rayForPixel(uint32_t pixelX, uint32_t pixelY)
Ray Camera::rayForPixel(uint32_t pixelX, uint32_t pixelY, double horzOffset, double vertOffset)
{
double xOffset = ((double)pixelX + 0.5) * this->pixelSize;
double yOffset = ((double)pixelY + 0.5) * this->pixelSize;
@@ -50,8 +51,8 @@ Ray Camera::rayForPixel(uint32_t pixelX, uint32_t pixelY)
double worldX = this->halfWidth - xOffset;
double worldY = this->halfHeight - yOffset;
Tuple pixel = this->inverseTransform * Point(worldX, worldY, -1);
Tuple origin = this->inverseTransform * Point(0, 0, 0);
Tuple pixel = this->inverseTransform * Point(worldX, worldY, -this->focalDistance);
Tuple origin = this->inverseTransform * Point(horzOffset, vertOffset, 0);
Tuple direction = (pixel - origin).normalise();
stats.addCastedRay();
@@ -70,9 +71,25 @@ Canvas Camera::render(World world, uint32_t depth)
{
for (x = 0 ; x < this->horizontalSize ; x++)
{
Ray r = this->rayForPixel(x, y);
Tuple colour = world.colourAt(r, depth);
Tuple colour;
if (this->apertureSize > 0)
{
int i;
for (i = 0 ; i < this->rayCount ; i++)
{
double horz = frandclip(-this->apertureSize/2, this->apertureSize / 2);
double vert = frandclip(-this->apertureSize/2, this->apertureSize / 2);
Ray r = this->rayForPixel(x, y, horz, vert);
colour = colour + world.colourAt(r, depth);
}
colour = colour / this->rayCount;
}
else
{
Ray r = this->rayForPixel(x, y);
colour = world.colourAt(r, depth);
}
stats.addPixel();
image.putPixel(x, y, colour);
}