Oc scanner an opengl 4.3 support zip file#
Oc scanner an opengl 4.3 support code#
Oc scanner an opengl 4.3 support download#

With a global illumination approach, soft shadows and ambient occlusion should occur naturally, given enough accuracy / resolution. The specular cone in my demo takes as long to trace as all 5 diffuse cones combined. Also the cones would be fairly narrow, which is bad for performance. For each pixel, youвЂ™d need to trace a cone for each point light, so it wouldnвЂ™t scale well to a lot of lights. I donвЂ™t think the performance would be very good, though. You could probably do soft shadows that way. The effect isnвЂ™t that pronounced in my demo though вЂ“ either because IвЂ™m not casting enough cones (IвЂ™m only doing a few, very coarse cones per pixel) or because I may have just gotten part of the implementation wrong рџ™‚ Also, area lights (if voxelized along with everything else) will naturally provide softer lighting. If thereвЂ™s an occluder, it should block (partially or entirely) the transfer of light when tracing a cone. Regarding soft shadows, I think you just get these for free. I think you end up with only one or two voxels exported per rasterized pixel, depending on how many slices along the major axis the triangle is crossing. I think either the original VCT paper or a related paper on fast voxelization talks about this вЂ“ itвЂ™s pretty straightforward aside from how intrusive conservative rasterization can be.

Oc scanner an opengl 4.3 support code#

YouвЂ™d need to add a geometry shader stage to expand the triangles plus some extra clipping code in the fragment shader to get efficient conservative rasterization, and then youвЂ™d also pick the major axis in the geometry shader to rasterize against and have the fragment shader output to all touched voxels.

IвЂ™m rendering the scene 6 times just for simplicity. On my GTX 680 with R310.70, the demo runs at around 30 FPS:Д¬onservative rasterization would likely be faster. The demo requires the OpenGL 4.3 support.

Oc scanner an opengl 4.3 support zip file#

The zip file includes the binaries files as well as the source code (Visual Studio 2010 project).

Oc scanner an opengl 4.3 support download#

You can download the demo from this link. There may be ways to work around this deficiency: sparse textures (GL_AMD_sparse_texture), compression, or hybrid schemes that mix tree structures with 3D textures.

The clear downside is the space requirement: 3D textures canвЂ™t scale to larger scenes or smaller, more detailed voxels. Compared to SVO in the context of voxel cone tracing (as opposed to ray casting, where SVO is a clear winner), 3D textures allow for easier filtering, direct lookups without evaluating the octree structure, and potentially better cache and memory bandwidth utilization (depending on cone size and scene density).

Sparse voxel octrees were not implemented due to time constraints, but would have been nice to have as a baseline reference. This demo served both as a means to familiarize myself with voxel cone tracing and as a testbed for performance experiments with the voxel storage: plain 3D textures, real-time compressed 3D textures, and 3D textures aligned with the diffuse sample rays were tested. in Interactive Indirect Illumination Using Voxel Cone-Tracing, with the Crytek Sponza model used for content. Here is an implementation of global illumination (GI) using voxel cone tracing, as described by Cyril Crassin et al.