## Search found 16 matches

Sat Apr 17, 2021 10:57 pm
Forum: General Development
Topic: Recursive indirect lighting
Replies: 1
Views: 473

### Re: Recursive indirect lighting

I realized that I needed to actually account for the fall off, due to accumulation through the process, vs. photon mapping where you only record the final location.
Wed Apr 14, 2021 7:58 pm
Forum: General Development
Topic: Recursive indirect lighting
Replies: 1
Views: 473

### Recursive indirect lighting

So I was playing around with global illumination by having my lighting function accumulate ambient light by selecting a random ray from the point of collision, and sampling the collision, then repeating that "recursively" (in a accumulating loop), and to me intuitively this should handle caustics, b...
Thu May 16, 2019 2:36 am
Forum: Visuals, Tools, Demos & Sources
Topic: Glitch Pictures anyone?
Replies: 81
Views: 125415

### Re: Glitch Pictures anyone?

Fri Feb 22, 2019 3:56 am
Forum: Visuals, Tools, Demos & Sources
Topic: My first real RT
Replies: 0
Views: 2958

### My first real RT

I decided to learn rust by writing a raytracer, and finally got to the point of having a ray tracer with a semi-decent feature set:

You can see all the standard photon mapping problems -- halos at the top of the arch, and photon bleeding on the back wall.
Thu Feb 21, 2019 7:07 pm
Forum: General Development
Topic: Bump mapping/computing normal derivatives
Replies: 1
Views: 2916

### Re: Bump mapping/computing normal derivatives

And as is the nature of such posts, it made me think of a potential issue, and I discovered it computed inverted dpdu/dpdv for clockwise vs counterclockwise triangle definitions (I think w.r.t triangles with explicitly specified normals)
Thu Feb 21, 2019 8:10 am
Forum: General Development
Topic: Bump mapping/computing normal derivatives
Replies: 1
Views: 2916

### Bump mapping/computing normal derivatives

I've been working on bump mapping in my RT (technically not my first, but definitely my first attempt to create an actually capable one). A lot of basic googling seems to imply the use of ray differentials, but I'm not sure I understand why that is necessary - obviously they have benefits for other ...
Thu Feb 21, 2019 1:13 am
Forum: Visuals, Tools, Demos & Sources
Topic: Optix 6.0 Path Tracing demo
Replies: 8
Views: 10268

### Re: Optix 6.0 Path Tracing demo

Okie dokie :) I'm still trying to work out what it should be doing (this is my first real attempt to implement PM). I'm getting a huge blow out on the direct photons, and a rapid drop in the propagation following the first bounce. (I'd search the board but photon mapping is apparently too common to ...
Wed Feb 20, 2019 6:58 am
Forum: Visuals, Tools, Demos & Sources
Topic: Optix 6.0 Path Tracing demo
Replies: 8
Views: 10268

### Re: Optix 6.0 Path Tracing demo

@jbikker: ok, possibly dumb question - how do you handle convert the emission coefficients from the wavefront into optix? I'm doing the dumbest thing possible with and doing ke * light colour ?
Wed Feb 20, 2019 2:27 am
Forum: Visuals, Tools, Demos & Sources
Topic: Optix 6.0 Path Tracing demo
Replies: 8
Views: 10268

### Re: Optix 6.0 Path Tracing demo

It is indeed -- I wonder if I dismissed it due to my RT not being able to handle it earlier.

Now to work out why my photon mapping is weird and blown out.
Tue Feb 19, 2019 3:24 am
Forum: Visuals, Tools, Demos & Sources
Topic: Optix 6.0 Path Tracing demo
Replies: 8
Views: 10268

### Re: Optix 6.0 Path Tracing demo

Would you mind if I used your version of the sponza model to test my own renderer?

The various open licensed versions I've found lack the detailing and have some questionable texture coords.

Also it's nice to be able to be able to compare exact scene rendering to an actual good renderer