I'm trying to get a shading system based on lightmaps created underneath textures.
Essentially what I'm trying to do in order is :
Draw the normal screen.
Draw the lightmap to a separate frame buffer object.
Draw the lighting to another separate frame buffer object.
On the lightmap black = no light, white = all light. Get the lighting pixel at the same coordinate as the lightmap pixel, and transfer the pixel color over and adjust the opacity according to the darkness of the lightmap. Draw the result to yet another frame buffer object.
Draw the last frame buffer object with the final lighting texture over everything.
How can I get the pixel data from a FBO in libGDX to accomplish this?
Related
I'm trying to create a handwriting game with AS3 on Adobe Animate. I've created my board, functions(drawing, erasing, saving, printing and color pannel) so far. But i need to show a score. To do it i thought if i can calculate the percentege of intersection between drawing and a bitmap image(which is my background for now).
Is there any way to do it? Or can you at least tell me with which function should i try that? Thanks a lot.
Note: Here is 2 images from my game. You can easily understand what am i trying to explain and do.
players will try to draw correctly(drawn board)
Empty Board
just a suggestion,
lets assuming that you are recording draw data, a set of points according the frame rate that records mouse positions inside an array.
i used 8 points in my own example, the result would be like this: (6 of 8 = 75% passed)
► black line is correct path(trace btimap) ► red is client draw
we need to search whole of the points array and validate them, so a percentage will be gain easily
how to validate
each point contain x and y, to check if its placed on a black pixel (bitmap trace) we just do
if (bitmapData.getPixel(point.x, point.y) == 0x0) // 0x0 is black
getPixel returns an integer that represents an RGB pixel value from a
BitmapData object at a specific point (x, y). The getPixel() method
returns an unmultiplied pixel value. No alpha information is returned.
Improvment
this practice would be more accurate when there is really more captured points during draw, also the Trace-Bitmap must be like this (above image), not a Dashed (smoothed, styled, ...) Line, however you can use this trace bitmap in background (invisible) and only present a dashed copy of that with a colorful background (like grass and rock textures or any graphical improves) to players.
Note
also define a maximum search size if you need more speed for validating draw. this maximum will be used to ignoring some points, for example if max=5 and we have 10 points, 0,2,4,6,8 can be ignored
I am making an interactive animation which background images are masked by a shape captured in a camera. In the every frames, camera changes images into black and white images and then it's used to mask background images.
In the code, "now" is the images captured by camera, "P1" is the back ground image.
After I masked by using blend mode multiply, I wish to store the result image which is masked and use for other things.
I don't understand when I use blendmode function, how the result is defined well.
Can I capture, copy or store the result image?
var P1:MovieClip = new p1();
var mskimg:MovieClip = new maskimage();
var bitmap_obj:Bitmap = new Bitmap(now);
addChild(P1);
P1.blendMode = BlendMode.LAYER;
addChild(bitmap_obj);
bitmap_obj.blendMode = BlendMode.MULTIPLY;
You can draw a masked object if you put everything that you intend to be drawn into a container, then call BitmapData.draw() to draw the complete layered object to some BitmapData. Then, you can use that bitmap data to do whatever you want, Graphics.beginBitmapFill(), FileReference.save(), whatever. The operation is however expensive, so it'll be better if you trigger the drawing by responding to a user action, and not do that every frame by default, unless required by your application's logic.
I am working on a game to compare a kid drawing (with mouse or gesture) to numbers from 1 to 9, is converting the drawing to bitmap and compare it with number converted to bitmap a good idea?
and how to handle the difference in size (width-height) between the 2 images?
Thanks
You can do it with image comparison, but it's pretty tricky to get it right.What I would suggest is:
Pre-generate small (10x10 pixels or even smaller) grayscale images of the numbers and blur them a little
Convert drawing to grayscale
Blur drawing a bit
Crop borders from drawing
Resize drawing down to the size of your number images;
Compare the small drawing image with the generated number images, pixel by pixel and be lenient to what you accept as a match.
You can try Mouse Gesture Recognition
var gesture:MouseGesture = new MouseGesture(stage);
gesture.addGesture('B','260123401234');
gesture.addEventListener(GestureEvent.MATCH,matchHandler);
function matchHandler(event:GestureEvent):void
{
trace (event.datas + ' matched !')
}
I have a field made up of BitmapData, which I use for pixel-precise hit detection.
However, BitmapData naturally stores 2^32 (or 2^24 with no alpha?) possibilities for each pixel. I only need 2 - black or white.
But I still need to use .draw to make other objects being drawn onto that BitmapData. It doesn't need to be visible.
Extracting a pixel for hit-detection does not seem too difficult - but drawing without cycling through each pixel seems hard. Is it possible?
What would the right approach for this problem be?
If you depend on having your bitmap data to be black or white only, you can employ BitmapData.threshold() after drawing a new mask over that bitmap. To turn your existing BitmapData to black and white with a threshold of half red channel do the following:
bd.threshold(bd,bd.rect,new Point(),"<",0x00800000,0x0,0x00ff0000,true);
bd.threshold(bd,bd.rect,new Point(),">=",0x00800000,0x00ffffff,0x00ff0000,true);
The first call with turn all points that have red below 0x80 black, the second will turn all the remaining points white. Change the mask and threshold value to use green or blue channels if you want. Consider applying a properly channeled ColorTransform object to your draw calls to make the mask correctly applied to a newly drawn object.
I am working on a Action Script 3.0 application , in which i ill be allowed to load the image and make them draggable. Consider i am loading the deer image and making it as draggable.
Problem with this is , if i click on the translucent area ( white space around the bitmap ), i dont want the bitmap to draggable.is there any way to draw the deer boundary region exactly without the white space around it.
You can use BitmapData methods to get each pixel color, and then, you can either :
On creation, for each pixel if it's not fully transparent (!= 0) you can draw a point of a Shape, which will be transparent, and make it dragable in place of your bitmap (as noticed in comment, it will be quite CPU consuming, so use the second method)
On click, get the click coordinate relative to the bitmap, check if the pixel is transparent and make it drag only if it's not.
In either way, that will be quite CPU consuming. You may also consider convert your bitmap to a vector image (Sprite). This will allow flash to detect real images boundaries.