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mahendragr

Member Since 06 Jan 2010
Offline Last Active Sep 08 2011 02:27 AM

Topics I've Started

Scale values from one range to another, but seems tricky

07 September 2011 - 12:11 PM

I have an array, whose size is 256. This array has elements which are in 0 to 1 range. Now, i need an array whose size should be 65536, where each element should be interpolated or scaled from the original array of 256 values. Some kind of mapping where, lets say, 10 values from the original image should match to more number values in the bigger array. Is it doable?

kd-tree in volume rendering

04 August 2011 - 08:02 AM

Hi all,

I have a weird situation with kd-trees. I have implemented a kd-tree for volume rendering, which is also used for load balancing in a cluster-like environment. For example if there are two machines, each machine gets a part of the tree starting from the root and renders its portion. However, when i detect a load imbalance, i move the subdivision plane in the kdtree so that the machine which is slower gets less number of leaves(which contain the data), the problem now is, when i move the sub-division plane, i have two new bboxes, which are inturn divided again(which i dont want to happen as i save the old leaves based in its bbox and reuse them to prevent data reloading). My question is, how should i stop my tree from being subdivided again into smaller chunks, which are less than the leaf size :(

Regarding my thesis

11 February 2011 - 04:36 PM

Hello all,

I'm a student studying in a university in germany, i'm about to start my thesis and thinking about volume rendering domain. Can one tell me where i can find the latest research topics on volume rendering?, my professor wants some ''new'' work in the field, i already proposed him a GPU cluster based volume rendering, but he isnt happy with that, so it would be really nice if somebody points me to new-latest topics in volume rendering,

Thanks and regards

BRDF implementation problem

15 May 2010 - 06:05 AM

Hello guys, I have a weird situation now, i'm trying to implement BRDF for my raytracer. This is my situation : Given : outgoing direction of ray incoming direction of ray normal color at that point variance of the gaussian lobe and I want to : implement BRDF by centering a gaussian normal distribution around the reflection direction for perfectly specular reflection question is : how to center the gaussian distribution!

How to generate rays in a simple ray tracer/pin hole camera

04 May 2010 - 10:21 PM

Hello guys, Sorry if this is a repost. But i didnt find a proper solution/answer for my question. I want generate rays for my ray tracer. I have the following in hand : 1.Up/right/view vectors of my camera 2.origin of my camera 3.(x,y) - the pixel co ordinates. 4.width and height of my image plane. 5. distance from camera to image plane. I know i shud use field of view, but i'm not able to figure it out. i can set the origin of the ray ray.origin(cam_origin); but i have to set the direction of my camera (how to do it?!)

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