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ModelRenderable.builder() .setSource(this, Uri.parse("models/andy.sfb")) .build() .thenAccept(renderable -> arrowRenderable = renderable) .exceptionally( throwable -> { // Handle errors while loading the model return null; } ); arFragment.getArSceneView().getScene().addOnUpdateListener(frameTime -> { // Get the current AR frame com.google.ar.core.Frame frame = arFragment.getArSceneView().getArFrame(); if (frame == null) { return; } // Get the camera's current position (user's position in AR space) Pose cameraPose = frame.getCamera().getPose(); float[] cameraPosition = cameraPose.getTranslation(); // Define the destination 50 meters ahead in the Z direction (adjust axis as needed) float[] destinationPosition = new float[]{cameraPosition[0], cameraPosition[1], cameraPosition[2] - 50.0f}; // Place footsteps along the path placeFootstepsAlongPath(cameraPosition, destinationPosition, arFragment); }); } // Rotate the arrow node to point towards the destination private void placeFootstepsAlongPath(float[] startPosition, float[] endPosition, ArFragment arFragment) { // Calculate the direction vector from start to end float[] directionVector = new float[]{ endPosition[0] - startPosition[0], endPosition[1] - startPosition[1], endPosition[2] - startPosition[2] }; // Calculate the total distance between the start and end positions float totalDistance = calculateDistanceBetweenPoints(startPosition, endPosition); // Normalize the direction vector (unit length) float[] unitVector = new float[3]; for (int i = 0; i < 3; i++) { unitVector[i] = directionVector[i] / totalDistance; } // Define the spacing for footsteps (e.g., every 1 meter) float footstepSpacing = 20.0f; float distanceCovered = 0.0f; // Loop to place footsteps along the path while (distanceCovered < totalDistance) { // Calculate the next position for the footstep float[] nextPosition = new float[]{ startPosition[0] + unitVector[0] * distanceCovered, startPosition[1] + unitVector[1] * distanceCovered, startPosition[2] + unitVector[2] * distanceCovered }; // Place a footstep object at this position placeFootstepAtLocation(nextPosition, arFragment); // Increment the distance covered distanceCovered += footstepSpacing; } } // Function to place a footstep object at a given location private void placeFootstepAtLocation(float[] position, ArFragment arFragment) { // Create a Pose at the given position (adjust for rotation if needed) if (arFragment.getArSceneView().getArFrame() != null && arFragment.getArSceneView().getArFrame().getCamera().getTrackingState() == TrackingState.TRACKING) { // ARCore is ready, proceed to create the anchor Pose pose = new Pose(position, new float[]{0f, 0f, 0f, 1f}); currentAnchor = arFragment.getArSceneView().getSession().createAnchor(pose); // Create an AnchorNode and attach it to the AR scene AnchorNode anchorNode = new AnchorNode(currentAnchor); anchorNode.setParent(arFragment.getArSceneView().getScene()); // Add a TransformableNode with a footstep model TransformableNode footstepNode = new TransformableNode(arFragment.getTransformationSystem()); footstepNode.setParent(anchorNode); footstepNode.setLocalScale(new Vector3(0.2f, 0.2f, 0.2f)); // Adjust scale for the footstep if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { ModelRenderable.builder() .setSource(arFragment.getContext(), Uri.parse("models/andy.sfb")) // Replace with footstep model .build() .thenAccept(footstepNode::setRenderable) .exceptionally(throwable -> { Toast.makeText(arFragment.getContext(), "Error loading footstep model", Toast.LENGTH_LONG).show(); return null; }); } } else { // ARCore is not yet tracking, handle this state (e.g., prompt the user to move the device) Toast.makeText(this, "AR is not tracking. Move your device to find a surface.", Toast.LENGTH_SHORT).show(); } } // Function to calculate the distance between two points in AR space private float calculateDistanceBetweenPoints(float[] start, float[] end) { float dx = end[0] - start[0]; float dy = end[1] - start[1]; float dz = end[2] - start[2]; return (float) Math.sqrt(dx * dx + dy * dy + dz * dz); }
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