Thanks Allen, I am sure a lot of us will find plenty of use for your code:
Sadly I have just spent the last couple of days working on a similar matter
yet more complex:
The data I get is not from a grid=> more like a cloud of surface points.
to solve this problem, the first step has to be a triangulation of the data
set ( I have used delaunay algo).
Then I been able to use j3d normal generator and stripifier.
For those interested, the results are much better than I even expected
(especially using jdk1.3 alpha!!)
--
Olivier Fillon Minestar Project
[EMAIL PROTECTED] Mincom Limited
Ph.+61-7-3303-3344 61 Wyandra Street
Fax+61-7-3303-3232 Teneriffe Qld. 4005.
Australia
Company home page: http://www.mincom.com/
Personal home page: http://www.home.gil.com.au/~fillon
--
The
-----Original Message-----
From: Allen McPherson <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Thursday, September 23, 1999 8:39 AM
Subject: Re: [JAVA3D] Java3D Terrain
>Duke Gard wrote:
>>
>> Does anyone have a recommended way of depicting crude looking terrain
with
>> Java3D.
>
> Attached are a couple of classes from my forthcoming book.
>
> The first is Mesh.java which constructs a tri-strip mesh
> using a passed array of post heights. The post heights
> can represent anything from a 2-D mathematical function
> to terrain elevations. Post heights should be scaled into
> [0-1] (or even [0-0.3]) range before the Mesh is created.
>
> The second is a simple default appearance I use--Chrome.java.
>
> You'll need to remove the package statements to use them.
>
> I've also attached a screen dump showing the Mesh being used to
> display some digital terrain. It's a 1200x1200 DEM file
> of the area in northern New Mexico where I live.
>
> Here's a snippet of code that shows how to load the post
> arrays and create the mesh. If you use really big meshes
> you'll need to run java with the -Xms128m and -Xmx256m
> switches.
>
>=================================
> protected void addScene() {
> final int ROWS = 1200;
> final int COLS = 1201;
> float posts[][] = new float[ROWS][COLS]; // Heights
>
> // Open DEM file and read terrain elevations. Keep track of the
> // Maximum elevation to properly scale the unit-size mesh.
> try {
> FileInputStream fis = new FileInputStream(demFile);
> DataInputStream din = new DataInputStream(fis);
> for (int r=0; r<ROWS; r++) {
> for (int c=0; c<COLS; c++) {
> int elev = din.readShort();
> posts[r][c] = (float)elev;
> }
> }
> }
> catch (IOException e) {
> System.err.println(e);
> }
>
> // Find maximum elevation
> float maxElev = 0.0f;
> float minElev = 0.0f;
> for (int r=0; r<ROWS; r++) {
> for (int c=0; c<COLS; c++) {
> if (posts[r][c] > maxElev) {
> maxElev = posts[r][c];
> System.out.println("max to: " + maxElev);
> }
> if (posts[r][c] < minElev) {
> minElev = posts[r][c];
> System.out.println("min to: " + minElev);
> }
> }
> }
> System.out.println("Max elevation: " + maxElev);
> System.out.println("Min elevation: " + minElev);
>
> // Scale the elevations to maximum of 1.0
> for (int r=0; r<ROWS; r++) {
> for (int c=0; c<COLS; c++) {
> if (posts[r][c] < 0)
> posts[r][c] = 0;
> posts[r][c] = posts[r][c] / (maxElev * 12);
> }
> }
>
> Mesh filledMesh = new Mesh(posts);
> // Use the following to try different appearances.
> if (false) {
> Appearance app = filledMesh.getAppearance();
> app.setMaterial(new Material(
> new Color3f(0.65f, 0.45f, 0.25f), // ambient
> new Color3f(0.0f, 0.0f, 0.0f), // emmisive
> new Color3f(0.65f, 0.45f, 0.25f), // diffuse
> new Color3f(0.4f, 0.4f, 0.4f), // specular
> 128.0f * 0.7f)); // shininess
> }
> top.addChild(filledMesh);
> }
>=======================
>
> Bug reports and feedback are welcome. I haven't tried to compile
> it outside of my framework, so let me know if you're unable to
> build it.
>
>--
>Allen L. McPherson Member Holstein Aerobatic Club
>Los Alamos National Laboratory Scientific Viz / Advanced Computing Lab
>Box 1663 Group:CIC-ACL MS:B287 [EMAIL PROTECTED]
>Los Alamos, NM 87545 Voice: (505) 665-6548 Fax: (505) 665-4939
>[Personal mail to: [EMAIL PROTECTED]]
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JAVA3D-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
