Hello,
If I apply multiple textures to multiple geometries in the same Shape3D
using a custom COMBINE mode, textures disappear.
As a test, I implemented a COMBINE mode version of j3d's built-in DECAL
mode. Then, in turn, I applied the custom version and the built-in version
to the same multi-geometried, mult-textured shape. The results were
different. The built-in DECAL mode has the desired effect, but the COMBINE
version causes textures to unexpectedly disappear. (Test code is given
below).
Are COMBINE modes necessarily inferior to built-in modes when used with
multiple textures and geometries, or is this a bug? Am I doing something
wrong? Is it my hardware (I do not have access to different platforms)? Any
other ideas?
Thanks,
Stoney
P.S. Is there an archive for this email list?
/* To reproduce my results, construct a Shape with a BuiltinDecal or a
* CombineDecal and insert the Shape into a scene graph.
*/
/**
* TextureAttribute using the built-in DECAL mode.
*/
public class BuiltinDecal extends TextureAttributes {
public BuiltinDecal() { setTextureMode(DECAL); }
}
/**
* A custom "decal" implementation using j3d's "combine" api.
*/
public class CombineDecal extends TextureAttributes {
public CombineDecal() {
setCombineRgbMode(COMBINE_INTERPOLATE);
setCombineRgbSource(0, COMBINE_TEXTURE_COLOR);
setCombineRgbFunction(0, COMBINE_SRC_COLOR);
setCombineRgbSource(1, COMBINE_OBJECT_COLOR);
setCombineRgbFunction(1, COMBINE_SRC_COLOR);
setCombineRgbSource(2, COMBINE_TEXTURE_COLOR);
setCombineRgbFunction(2, COMBINE_SRC_ALPHA);
setCombineAlphaMode(COMBINE_REPLACE);
setCombineAlphaSource(0, COMBINE_OBJECT_COLOR);
setCombineAlphaFunction(0, COMBINE_SRC_ALPHA);
}
}
/**
* A shape with two geometries and two textures. The geometries are left and
* right adjacent rectangles colored opaque black. The textures are of a "0"
* and a "1" rendered in opaque white on a transparent black background. The
* "0" is applied to the left rectangle, and the "1" is applied to the
right.
* The textures are applied according the TextureMode in the
* TextureAttributes supplied in the constructor.
*
* Construct by passing a BuiltinDecal or CombineDecal.
*/
public class Shape extends Shape3D {
Font FONT = new Font("Courier", Font.PLAIN, 20);
FontRenderContext CONTEXT = new FontRenderContext(null, false, true);
Color FG_COLOR = Color.white;
Color BG_COLOR = new Color(0f, 0f, 0f, 0f);
Color3f GEOM_COLOR = new Color3f(0f, 0f, 0f);
public Shape(TextureAttributes attributes) {
// to hold the textures
TextureUnitState[] units = new TextureUnitState[2];
// construct the two textures
BufferedImage bi =
new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
drawText(bi, "0", FONT, CONTEXT, FG_COLOR, BG_COLOR);
ImageComponent ic =
new ImageComponent2D(ImageComponent.FORMAT_RGBA, bi);
Texture t = new Texture2D(Texture2D.BASE_LEVEL, Texture.RGBA, 32, 32);
t.setImage(0, ic);
units[0] = new TextureUnitState();
units[0].setTexture(t);
units[0].setTextureAttributes(attributes);
bi = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
drawText(bi, "1", FONT, CONTEXT, FG_COLOR, BG_COLOR);
ic = new ImageComponent2D(ImageComponent.FORMAT_RGBA, bi);
t = new Texture2D(Texture2D.BASE_LEVEL, Texture.RGBA, 32, 32);
t.setImage(0, ic);
units[1] = new TextureUnitState();
units[1].setTexture(t);
units[1].setTextureAttributes(attributes);
Appearance a = new Appearance();
a.setTextureUnitState(units);
this.setAppearance(a);
this.removeAllGeometries();
float[] texCoords = getRectangle2d(0f, 0f, 1f, 1f);
Color3f[] colors = getColors(GEOM_COLOR);
QuadArray first =
new QuadArray(
4,
QuadArray.COORDINATES
| QuadArray.TEXTURE_COORDINATE_2
| QuadArray.COLOR_3,
1,
new int[] { 0, -1 });
first.setCoordinates(0, getRectangle3d(0f, 0f, 0f, .5f, .5f));
first.setTextureCoordinates(0, 0, texCoords);
first.setColors(0, colors);
this.addGeometry(first);
QuadArray second =
new QuadArray(
4,
QuadArray.COORDINATES
| QuadArray.TEXTURE_COORDINATE_2
| QuadArray.COLOR_3,
1,
new int[] { -1, 0 });
second.setCoordinates(0, getRectangle3d(.5f, 0f, 0f, .5f, .5f));
second.setTextureCoordinates(0, 0, texCoords);
second.setColors(0, colors);
this.addGeometry(second);
}
private static void drawText(
BufferedImage bi,
String s,
Font f,
FontRenderContext c,
Color foreground,
Color background) {
Graphics2D g = bi.createGraphics();
g.setPaint(background);
g.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g.setPaint(foreground);
TextLayout l = new TextLayout(s, f, c);
l.draw(g, 0, bi.getHeight() - l.getDescent());
g.dispose();
}
private static float[] getRectangle2d(
float x, float y, float w, float h) {
return new float[] { x, y, x + w, y, x + w, y + h, x, y + h };
}
private static float[] getRectangle3d(
float x, float y, float z, float w, float h) {
return new float[] {
x, y, z,
x + w, y, z,
x + w, y + h, z,
x, y + h, z };
}
private static Color3f[] getColors(Color3f color) {
return new Color3f[] { color, color, color, color };
}
}
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