programing a raytracer

[Kram1032]

cool reflections!
I like 'em

[oodmb]

[oodmb]

idea for normal smoothing algorithm:
(cant find any real internet sources on normal interpolation)

get the hit point
for each vertex on the triangle create a new ray through the hit point
get the length from the origin of that ray (vertex) to the line that it hits opposite of it using trig.
get the length from the origin to the hit point
for that vertex normalise the normal then scale it by (origin to hitpoint/origin to oposite edge).

add all the scalled vertex normals together then normalise that.

[oodmb]

new stuff: fixed the fresnel.

[arneoog]

This is getting very very nice, oodmb!
Good job!

But how long do these images take to render?

[oodmb]

about 10-15 seconds for a 400*400 image with supersampling of 2, and about 20-30 seconds for a 600*600 image with a supersampling of 4,
considering its written in java, i'd say thats fairly fast. it also lacks any optimization effort whatsoever, i'll do that later.

[oodmb]

yay, got normal smoothing working sort of (there is something wrong with how the actual normals are calculated resulting in black triangles if its input wrong again).

sorry mates, no more green, i lost that color:

[Kram1032]

but the new colour looks great, too
the darker parts on the top of the spheres, are those the patters, you mean?

It really looks great

[oodmb]

ok, i'm pretty sure that the turning black problem has nothing to do with normal smoothing, although i have no idea what it is because.

my problem:

triangles specified by 3 vertexes,0 1 3, turns black depending on how these verticies are configured
for example it turns black at two configureations: 3,0,1 and 1,0,3 but none of the other configurations

Code: Select all

       
Ray[] vert = {
                        new Ray(new Point(100, 0, -10), new Vector(0, .1, .1)),
                        new Ray(new Point(0, 100, -40), new Vector(0, .8, .8)),
                        new Ray(new Point( -100, 0, -10), new Vector(0, .1,.1)),
                        new Ray(new Point(0, -100, 80), new Vector(0, .8, .8)),
        };


           Objects[] objective = {
                                                  new Objects(new polygon(true, vert[3], vert[0], vert[1]), bdf),
}

[eman7613]

First debug, turn of normal smoothing and run it. No black lines, probably noram smoothing, still black lines, not normal smoothing problem

[oodmb]

its not black lines that are the problem, i fixed that one already. its not a normal smoothing problem, i've been debbuging it for the last day and it doesnt realy seem to be an algorithmic error either.

also- i just learned about static constructors in java for edditing static classes... i changed my scene and camera stuff to work like this and now it renders about twice as fast (3-5 seconds for 400*400 2osi). i'm happy.

[CTZn]

for example it turns black at two configureations: 3,0,1 and 1,0,3 but none of the other configurations

What about 0,3,1 (if that's possible) ? If 0,3,1 works ok I have no clue, sorry, if it doesn't maybe these triangles are created inverted, could it be ? In Maya (and some others apps I think) the direction of the normal of a created triangle depends on if you created the vertices clockwise or counter-clockwise (the later creating tris with normal facing toward the camera).

[oodmb]

0, 3, 1 works fine

[CTZn]

oki, good luck

[oodmb]

if anybody feels they can figure out the issue and can be trusted to not post my source on the internet, (and can read my rediculously messy non documented/notated code) i'd be more than happy to pm you a coppy of the source without password protection.