terrain

I'm trying to have mutiple materials on a single plane to make a simple terrain editor. So I create a couple of materials, and try to assign a matetrial index to each vertex in my plane: var materials = []; materials.push(new THREE.MeshFaceMaterial( { color: 0xff0000 })); materials.push(new THREE.MeshFaceMaterial( { color: 0x00ff00 })); materials.push(new THREE.MeshFaceMaterial( { color: 0x0000ff })); // Plane var planegeo = new THREE.PlaneGeometry( 500, 500, 10, 10 ); planegeo.materials = materials; for(var i = 0; i < planegeo.faces.length; i++) { planegeo.faces[i].materialIndex = (i%3); }

I'm trying to implement some source code I found online to generate a height map using Perlin Noise. I've successfully managed to get the height map using the noise3 function, with the third coordinate being a random "seed", to allow for random height maps. My problem is that the terrain generated is rather dull - I want mountains and I'm getting rolling grassland. I've done some reading up on Perlin Noise (mostly here ). Due to the source code I've found obviously not written with readability in mind and my weak grasp on the concept of Perlin Noise in general, I can't figure out what I need

My approach is to calculate two tangent vectors parallel to axis X and Y respectively. Then calculate the cross product to find the normal vector. The tangent vector is given by the line that crosses the middle point on the two nearest segments as is shown in the following picture. I was wondering whether there is a more direct calculation, or less expensive in terms of CPU cycles. You can actually calculate it without a cross product, by using the "finite difference method" (or at least I think it is called in this way). Actually it is fast enough that I use it to calculate the normals on the

I've been searching on google, but cannot find anything basic. In it's most basic form, how is dual contouring (for a voxel terrain) implememted? I know what it does, and why, but cannot understand how to do it. JS or C# (preferably) is good.Has anyone used Dual contouring before and can explain it briefly? Mikola Ok. So I got bored tonight and decided to give implementing dual contouring myself a shot. Like I said in the comments, all the relevant material is in section 2 of the following paper: Original Version: http://www.frankpetterson.com/publications/dualcontour/dualcontour.pdf Archived

I have a pet project to create images of maps, where I draw the roads and other stuff over a contour plot of the terrain elevation. It is intended to plan mountain bike routes (I have made some vectorial drawings by hand, in the past, and they work great for visualization). Currently, I download Digital Elevation Model, in GeoTIFF, from here: http://www.ecologia.ufrgs.br/labgeo/arquivos/downloads/dados/SRTM/geotiff/rs.rar and then create the plot with GDAL and Matplotlib contourf function: from osgeo import gdal import matplotlib import matplotlib.pyplot as plt from pylab import cm import