Todd Vanderlin » opengl

First Grass Renders

Todd Vanderlin — Mon, 28 Sep 2009 20:00:30 +0000

Here are some first grass attempts for a piece I’m working on. There are 4,096 blades of grass with about 15 circular segments per blade. The are built with VBO’s running at about 50fps. I would love to get a few more FPS with some optimization.

watch HD here

Diggin 3D Worms

Todd Vanderlin — Sun, 27 Sep 2009 20:43:09 +0000

Working on some grass for a piece I’m working on. This is my first time generating 3d geometry for a worm/grass. Oh man this is fun.

Normals

Todd Vanderlin — Tue, 22 Sep 2009 23:36:45 +0000

Finally got normals working for the height map. Brad helped me a ton with the math, thanks brad :). After making sure I had the right points its was pretty simple.

Here is an example to calculate normals for a grid in OpenFrameworks. Obviously this can be applied to any other language.

The image above we have four points on a plane. We need three of those points:

ofxVec3f p1(x1, y1, z1);

ofxVec3f p2(x2, y2, z2);

ofxVec3f p3(x3, y3, z3);

We now need a vector from p1 to p2 and p1 to p3.

ofxVec3f v1 = p1 - p2;

ofxVec3f v2 = p1 - p3;

We need the cross product of v1 and v2. This will give us our normal vector. Next we normalize that vector scale it and add p1.

ofxVec3f normalVec = v1.cross(v2);

normalVec.normalize();

normalVec *= 50.0;

normalVec += p1;

Now render from p1 to normal vector.

ofSetColor(255, 0, 0);

glVertex3f(normalVec.x, normalVec.y, normalVec.z);

glVertex3f(p1.x, p1.y, p1.z);

Scrolling Terrain

Todd Vanderlin — Tue, 15 Sep 2009 04:23:55 +0000

The terrain is now scrolling. I’m not using a VBO so its a bit slow but that’s an easy fix. I now want to try and apply a sphere to the grid.

Terrain Height Maps

Todd Vanderlin — Sat, 12 Sep 2009 22:43:33 +0000

These are some terrain height maps built from NOAA’s Planetary Maps. The images are super high res about 2000×1500 pixels, the geometry is calculated and a display list is used for rendering. I think next im going to try and create a VBO out of the geometry so that I can alter the map in realtime.

Projection Wall at Arnold

Todd Vanderlin — Tue, 09 Dec 2008 23:28:15 +0000

We got a new conference room at Arnold with an amazing projection wall. I could not wait to get in there and play. The wall is a very funny aspect ratio so I had to do some funny openGL business to compensate. There are two HD projectors 16:9 with a blended seam in the middle. I needed to figure out the gap and the actual pixel size of the wall to get it to work. Check out some little test I did, can’t wait to make something later.

OpenGL Crash

Todd Vanderlin — Thu, 04 Dec 2008 01:56:36 +0000

Ouch check out this crash my graphics card basically took a poop.

Some particle experiments

Todd Vanderlin — Wed, 23 Apr 2008 18:11:42 +0000

check out the HD ones here & here.
online pharmacycialislevitrasomaviagra

OCaml for Scientists

Todd Vanderlin — Wed, 20 Feb 2008 03:43:33 +0000

I want to get this book. “Learn one of the world’s most popular functional programming languages, with hundreds of awesome examples covering everything from simple numerical analysis to sophisticated real-time 3D visualisation using OpenGL. ” link

Processing Bug

Todd Vanderlin — Fri, 26 Oct 2007 22:37:01 +0000

Alpha bug in processing not sure how to fix it. As the images rotate in 3D space the bounding border is shown.

update: Fixed, well turned on depthTesting. This works but you loose track of depths.

Growth

Todd Vanderlin — Sun, 05 Aug 2007 03:03:05 +0000

A project I’m working on. Here is the first step, the plant life is alive. They follow the the bugs trying their hardest to grab them. Download (mac) the app and try it out. It was built in c++ using openFrameWorks. More to come.