How do I use video (mp4) as alpha map in babylonJS?
In three.js applying a video as texture is as simple as assigning the video texture to alphaMap (instead of the diffuse map).
Here's the expected result in three.js - Demo.
I attempted to do the same in babylonJS to no avail. Here's what I have so far babylonJs demo
var mat = new BABYLON.StandardMaterial("mat", scene);
var videoTexture = new BABYLON.VideoTexture("video", ["textures/babylonjs.mp4", "textures/babylonjs.webm"], scene, true, true);
mat.opacityTexture = videoTexture;
Any ideas are welcome.
Thanks
You can use videoTexture.getAlphaFromRGB = true; to use all three channels combined for the alpha. By default it only uses the red channel, which does not have enough variance in the source video for it to show.
The complete example:
var mat = new BABYLON.StandardMaterial("mat", scene);
var videoTexture = new BABYLON.VideoTexture("video", ["textures/babylonjs.mp4", "textures/babylonjs.webm"], scene, true, true);
videoTexture.getAlphaFromRGB = true;
mat.opacityTexture = videoTexture;
I'm setting a map to fitBounds using this line
var bounds = new google.maps.LatLngBounds(fromLoc, theLoc);
console.log(bound);
map.fitBounds(bounds);
As you can see when that line runs the map fully zooms out despite the 2 LatLng's only being around 20 minutes drive away.
Anyone know how I can fix this?
When you do this:
var bounds = new google.maps.LatLngBounds(fromLoc, theLoc);
You are creating a google.maps.LatLngBounds with the southWest corner at fromLoc and the northEast corner at theLoc.
To make a bounds that contains those two locations, do this instead:
var bounds = new google.maps.LatLngBounds(); // empty bounds
bounds.extend(fromLoc);
bounds.extend(theLoc);
map.fitBounds(bounds);
I'm having a very strange problem with my Google Maps implementation. I am getting back an array from a REST service that gives me lat/lng and I am in turn using that information to put markers on the map and implement functionality.
That part works fine, it's when it comes to taking the markers output on the page and getting their bounds and zooming the map to them that I get to the problem. I have read several solutions and I have attempted implementing them to the best of my ability.
Here's my implementation:
// Reset the maps bounds
MapView.bounds = new google.maps.LatLngBounds(null);
// Get the new map bounds
for (var i=0, j=MapView.markers.length; i<j; i++){
var marker = MapView.markers[i],
lat = marker.position.lat(),
lng = marker.position.lng(),
latlng = new google.maps.LatLng(lat, lng);
MapView.bounds.extend(latlng);
};
// Set the map bounds to the new bounds
MapView.map.fitBounds(MapView.bounds);
Here is a list of the coordinates being used:
21.245445,-105.167631
41.887668,-87.622522
49.817492,15.472962
50.075538,14.4378
33.951611,-118.387578
41.887668,-87.622522
14.782827,-90.793702
33.741973,-78.817013
45.922225,-95.408973
28.320306,-81.422964
36.166667,-86.783333
-17.82922,31.053961
-8.708704,115.169616
41.901514,12.460774
-34.013717,23.054811
20.483443,-86.971039
34.933333,34.083333
6.428055,-9.429499
38.79142,-95.960607
43.771033,11.248001
46.271588,13.95641
33.773,-78.779504
40.789342,-3.249749
20.926822,-156.695125
46.271588,13.95641
18.853921,-71.300939
36.462205,-5.011611
25.788969,-80.226439
50.36809,8.73632
37.540667,126.948346
45.495992,-121.5879
14.782827,-90.793701
0,0
13,-76
20.431006,-86.908065
40.75694,-73.984872
64.143935,-21.934099
-17.816667,25.15
12.879721,121.774017
32.640054,-117.084196
-16.522046,28.850942
40.280559,22.50584
39.202686,-106.831683
36.122611,-115.170973
38.79142,-95.960607
18.126285,-65.440099
22.876396,-109.918562
30.36884,-86.324846
36.076518,-115.153343
36.0443,14.251222
41.894809,-87.624214
36.0443,14.251222
-34.035086,23.046469
36.42,25.431667
-17.82922,31.053961
20.696686,-105.292631
18.533333,-68.366667
42.407211,-71.382437
21.158964,-86.845937
9.748917,-83.753428
14.782827,-90.793701
34.852965,32.361479
34.939737,32.461585
34.052234,-118.243685
64.143935,-21.934099
35.369598,24.482727
52.407927,3.222711
47.497912,19.040235
21.158964,-86.845937
37.446719,25.328862
21.160386,-86.843338
39.770247,21.182861
36.124253,-115.168476
46.421684,15.856075
116.468401,39.947856
41.553221,-70.608589
43.706449,7.292265
39.415044,21.737618
21.158964,-86.845937
20.629559,-87.126904
36.832012,25.897065
50.075538,14.4378
8.87509,98.352656
57.702051,11.982304
-24.183889,29.012778
38.904253,-77.047904
0,0
-25.360413,27.09947
55.940209,-3.225319
36.286023,-5.27918
-3.386069,39.971999
20.749045,-105.31098
17.280151,-62.689038
21.040195,-104.358146
14.782827,-90.793702
20.696686,-105.292631
50.071287,14.397221
51.891877,-8.493827
Then I used those bounds to create a poly line to try and find out where the problem was, and the wierd part is even that is wrong, but the map isn't even zooming/panning to THOSE bounds.
Code for poly line:
var ne = MapView.bounds.getNorthEast();
var sw = MapView.bounds.getSouthWest();
var boundingBoxPoints = [
ne, new google.maps.LatLng(ne.lat(), sw.lng()),
sw, new google.maps.LatLng(sw.lat(), ne.lng()), ne
];
var boundingBox = new google.maps.Polyline({
path: boundingBoxPoints,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
boundingBox.setMap(MapView.map);
And a picture of the result (this is as the map loads, un-altered):
It will either load like that (if I'm lucky) or load with most of the trips out of the top of the map with only a couple showing and most of the map canvas gray.
I am a total loss right now, could somebody please point me in the right direction?
I have created a mobile map with Cloudmade Leaflet and have it so a number of markers are generated to coincide with LatLong values in a database. However, I can't figure out how to set the initial Map view to set the zoom and centre the map on the group of markers. I presume I need to use setBounds but for this I need to know what the NorthEast and SouthWest coordinates are.
Do I need to go through the whole array of marker coordinates to find the North-most, East-most, South-most and West-mode values or is there an easier way?
You can use the fitBounds() method.
Leaflets reference
Create a L.LatLngBounds object and loop through your markers calling L.LatLngBounds.extend() for each lat/lng.
I think the easiest way would be to do something like this:
int minLat = int.MaxValue;
int minLong = int.MaxValue;
int maxLat = int.MinValue;
int maxLong = int.MinValue;
foreach (var point in coordinates)
{
minLat = Math.Min(point.Latitude(), minLat);
minLong = Math.Min(point.Longitude(), minLong);
maxLat = Math.Max(point.Latitude(), maxLat);
maxLong = Math.Max(point.Longitude(), maxLong);
}
This has worked well for me in C#.
map.fitBounds(markers.getBounds());
should work...provided you have same names as the examples..
var snapshot:ImageSnapshot = ImageSnapshot.captureImage(someSprite);
var file:FileReference = new FileReference();
file.save(snapshot.data,'abc.png');
In the above code I am able to capture an image.
But I also want to apply a scalingMatrix(for zoomIn/Out) and a clipping rectangle to it.
How to do it?
I tried capturebitmapdata too, but with that I can't even get a proper image. See here. So I don't want to use that.
sw = someSprite.stage.stageWidth;
sh = someSprite.stage.stageHeight;
var cr:Rectangle = new Rectangle(x,y,cw,ch);//you have to check that this clip rectangle should not overshoot your stage
//cr is the clip rectangle
var bmp:BitmapData = new BitmapData(sw,sh);
bmp.draw(someSprite,null,null,null,cr);
var bmp1:BitmapData = new BitmapData(cw,ch);
bmp1.copyPixels(bmp,cr,new Point(0,0));
var enc:JPEGEncoder = new JPEGEncoder();
var data:ByteArray = encoder.encode(bmd1);
new FileReference().save(data,'image.jpeg');
The above code allows you to draw only the portion inside the clip rectangle.
In my case I didn't have to take into account a scaling matrix, even though
I was using zoom In/Out features.