raytracing

I want to extract a depth map from a calibrated image and triangular mesh using OpenCV called from Matlab 2014b (using the OpenCV bindings). I am a regular user of Matlab but am new to OpenCV. I have the following inputs: im - an undistorted RGB image of the scene or - camera position vector R - rotation matrix describing camera pose points - nx3 triangular mesh vertex list representing the scene faces - mx3 triangular mesh face list EFL - image effective focal length in pixels I have written a native Matlab ray tracing engine to extract a depth map from these inputs, but this is quite slow

I'm working on a raytracer using C++, and so far I've been able to compute a lighting model based on diffuse, specular and ambient components. My problem appeared when I tried to add shadows to my scenes: the scenes get really messed up: My code is divided as follows: I have a base class "SceneObject", which has a virtual method intersect(), which takes a ray (defined by origin and direction) and outputs a boolean, as well as return arguments for the calculated t value, a hitpoint and the normal of the object. The "Material" class contains a specular and diffuse colours (vectors) as well as a

My Plane class has two fields: public Vector3 Norm; //normal vector public double Offset; //signed distance to origin This is the code I use for intersection, and I don't know if it is correct. I double checked my equations and everything, but I would like to get feedback from people more experienced with this. public override Intersection Intersect(Ray ray) { // Create Intersection. Intersection result = new Intersection(); // Find t. double t = - (Vector3.Dot(Norm,ray.Start) + Offset) / (Vector3.Dot(Norm, ray.Dir)); if (t < 0) // the ray does not hit the surface, that is, the surface is

I have a point (Lat/Lon) and a heading in degrees (true north) for which this point is traveling along. I have numerous stationary polygons (Points defined in Lat/Lon) which may or may not be convex. My question is, how do I calculate the closest intersection point, if any, with a polygon. I have seen several confusing posts about Ray Tracing but they seem to all relate to 3D when the Ray and Polygon are not on the same Plane and also the Polygons must be convex. sounds like you should be able to do a simple 2d line intersection... However I have worked with Lat/Long before and know that they

I wanted to use .obj format, but I noticed that it doesn't have representation for the type of material, i.e. opaque, transparent, reflective. Is there a common file format that includes that information as well, or should I just take the known .obj format and change it so that it'll include that info? you might want to check mtl-files. Haven't (yet) used it myself though ;) http://people.sc.fsu.edu/~jburkardt/data/mtl/mtl.html and http://people.sc.fsu.edu/~jburkardt/data/obj/obj.html Cheers .obj can referance .mtl files, which can hold opaque, transparent, reflective, colours, refractive

I've been hacking up a raytracer for the first time over the past few days. However, there are a few quirks which bother me and I don't really know how to work out. One that has been there since the beginning is the shape of spheres in the scene - when rendered, they actually look like ovals. Of course, there is perspective in the scene, but the final shape still seems odd. I have attached a sample rendering, the problem I have is especially visible on the reflective sphere in the lower left part of the image. I don't really know what could be causing this. It might be the ray-sphere