Loading multiple 3D objects from an Obj file (min3D for Android)

NOTE: This OpenGL ES 1.1 framework isn’t maintained anymore. Check out the OpenGL ES 2.0 Rajawali framework which also supports live wallpapers.

I just committed an update to min3D‘s .obj file parser.  Yesterday’s tutorial showed how you can import an .obj file into min3D.

The latest commit adds support for multiple files in one .obj file. In this example, the car’s body and 4 wheels are separate objects.

This is the RendererActivity code that shows you how to get the separate objects from the parsed file:

package min3d.sampleProject1;

import min3d.core.Object3d;
import min3d.core.Object3dContainer;
import min3d.core.RendererActivity;
import min3d.parser.IParser;
import min3d.parser.Parser;

public class ExampleLoadObjFileMultiple extends RendererActivity {
	private final float MAX_ROTATION = 40;
	private final float MAX_CAM_X = 6f;
	private Object3dContainer car;
	private Object3d tireRR;
	private Object3d tireRF;
	private Object3d tireLR;
	private Object3d tireLF;
	private int rotationDirection;
	private float camDirection;

	@Override
	public void initScene() {
		IParser parser = Parser.createParser(Parser.Type.OBJ,
				getResources(), "min3d.sampleProject1:raw/camaro2_obj");
		parser.parse();

		car = parser.getParsedObject();
		scene.addChild(car);

		tireRR = car.getChildByName("tire_rr");
		tireRF = car.getChildByName("tire_rf");
		tireLR = car.getChildByName("tire_lr");
		tireLF = car.getChildByName("tire_lf");

		tireLF.position().x = -.6f;
		tireLF.position().y = 1.11f;
		tireLF.position().z = .3f;

		tireRF.position().x = .6f;
		tireRF.position().y = 1.11f;
		tireRF.position().z = .3f;

		tireRR.position().x = .6f;
		tireRR.position().y = -1.05f;
		tireRR.position().z = .3f;

		tireLR.position().x = -.6f;
		tireLR.position().y = -1.05f;
		tireLR.position().z = .3f;

		car.rotation().x = -90;
		car.rotation().z = 180;

		scene.camera().position.x = MAX_CAM_X;
		scene.camera().position.z = 3.5f;
		scene.camera().position.y = 3.5f;

		rotationDirection = 1;
		camDirection = -.01f;
	}

	@Override
	public void updateScene() {
		tireRF.rotation().z += rotationDirection;
		tireLF.rotation().z += rotationDirection;

		if(Math.abs(tireRF.rotation().z) >= MAX_ROTATION)
			rotationDirection = -rotationDirection;

		scene.camera().position.x += camDirection;

		if(Math.abs(scene.camera().position.x) >= MAX_CAM_X)
			camDirection = -camDirection;
	}
}

View the result here (click on the image to see the video):