http://homepages.paradise.net.nz/nickam ... tracer.htm
it's nice and simple, not like Indigo
(altho there's probly some shared source code
)EDIT: it's in C++, not Java.. but at least the raytracing portion should be similar.
programing a raytracer
If you're new to programming, u might want to check out some raytracing code i created a while back:
http://homepages.paradise.net.nz/nickam ... tracer.htm
it's nice and simple, not like Indigo
(altho there's probly some shared source code )
EDIT: it's in C++, not Java.. but at least the raytracing portion should be similar.
http://homepages.paradise.net.nz/nickam ... tracer.htm
it's nice and simple, not like Indigo
(altho there's probly some shared source code
)EDIT: it's in C++, not Java.. but at least the raytracing portion should be similar.
i have finally produced an image of a sphere with shading with my raytracer. i am pleased. most of the time was spent finding a suitable way to initiate the camera and calculate the points of the pixels based on the camera's location and its film width. then there was that little setback of knowing practicaly nothing about linear algebra. now i feel really special. thanks for the links people.
a shiny monkey is a happy monkey
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mrCarnivore
- Posts: 517
- Joined: Sun Mar 04, 2007 6:20 am
- Location: Stuttgart, Germany
yah, there was a bug in the phong shading in the lower part of the sphere. since (five miniutes after the post) i realized that i had to clip my colors after phong. It has AA, its actualy realy easy to do in java- just set the image to render x larger than you want then scale it down size/x with a sampling algorithm of x acuracy. i discovered that if you do the sampling algorithm twice and only scale it down 1/2 x each time, you get much more accuracy.
i just finished adding painters algorithm to acount for multiple objects, added multiple the ability to have multiple lights and fixed the phong equations a bit. i still think there is a problem with how the specular is calculated in my phong. but as of now i don't have enough time to fix it. the color in the background is not an infinite plane, its actually a color system that i set up that finds the angle of the camera - pixel ray compared to camera -point ray that i was using to help me see if the camera was set up properly and all my vector stuff was working. -the dark in the back is not shadow, i don't have that yet, although both shadows and planes need only a couple more lines of code. that image only took maybe a two or three seconds to render.
best thing about this is my new ability to go up to people and completely confuse them with concepts and algorithms they have never heard of before.
newest image:
i just finished adding painters algorithm to acount for multiple objects, added multiple the ability to have multiple lights and fixed the phong equations a bit. i still think there is a problem with how the specular is calculated in my phong. but as of now i don't have enough time to fix it. the color in the background is not an infinite plane, its actually a color system that i set up that finds the angle of the camera - pixel ray compared to camera -point ray that i was using to help me see if the camera was set up properly and all my vector stuff was working. -the dark in the back is not shadow, i don't have that yet, although both shadows and planes need only a couple more lines of code. that image only took maybe a two or three seconds to render.
best thing about this is my new ability to go up to people and completely confuse them with concepts and algorithms they have never heard of before.
newest image:
a shiny monkey is a happy monkey
I think the above only applies to 2D primitives (e.g. smoothing the edges of a circle primitive), which won't be applicable in this case.eman7613 wrote:If you are drawing the image with the 2d api provided by java, it has a built in function for AA if i remember correctly that is very good. Dont take me word for it though, i hate programing graphics and try to avoid it at all costs ;p
Rather than rendering the image at 4x4 resolution then down-scaling, a quicker way to do simple AA is to render it at normal resolution then scan the resulting image for pixels with high local contrast. Then just create more samples for that pixel and replace it with the averaged result.
Ian.
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