Can someone provide an example of how to progressively blur a SKSpriteNode's image using Apple's Sprite Kit? For instance, let's say the user touches a button on the screen which will then trigger the background to slowly (i.e. progressively) blur until it reaches a specific threshold. Ideally, I would like to reverse the process too (e.g. allow the user to unblur the image by touching the same button).
There are two possible paths to take on this, both use SKEffectNodes
SKEffectNodes allow you to apply CI Filters to a node.
There is a CI Filter for Gaussian Blur. So Create a SKEffectNode, and assign it a blur filter, then add the button as a child.
How do you animate it?
Use SKAction to create a custom action, and change the parameters of filter, however, this can be slow and doesn't always give the 'progressive' blur effect you might expect, so what I do is this:
I create a filter and SKEffectNode like described above, then I render the result to a Texture, using SKView.textureForNode. I then add the resulting texture to an array, after that I loop this, continuinng to apply the blur effect on top of the previous image created, until I have a set number of frames. Then use the textures created to make an animation with SKAction.animateWithTextures. In my experience, this comes out very nicely.
Related
I'm using Blender 2.8 and I just have 2 objects: hand and gun and I want to create animations for them. So, for instance, I want to create a simple firing animation. What I do:
1. I create animation for gun
2. I create animation for hand
But if I switch somehow incorrectly I "lose" the first animation I've created. I tried creating fake users and stuff. I just don't get why I select the armature for which I've just created the animation, it plays, but there are no keyframes.
Here's the vid, here's the file.
Ask me questions if you have any.
The movement may be cached in Blender, you may need to reset the movement cache.
Alternatively, you should look at both the Track Controller and Dopesheet(action editor) - the animation may be stored in both.
The movement could be related to parenting ( to an object that is moving )
The movement could also be caused by physics simulation of a rigid body.
Hopefully with the help of the above, you find the problem.
I had the same problem. In the Animation mode (horizontal tabs across the top of the window), click on the object to animate.
The keyframes will appear.
If the object is not selected, the keyframes disappear.
Just leaving this here so that nobody spends 30 minutes trying to work this out, like i just did.
I have a large image background with several areas or objects in the images which can be clicked and an event is triggered. The method I'm currently using to accomplish this is by slicing the images of objects and area and positioning them over the background image and assigning a click handler to them.
This works for the moment but I feel that there should be a better way of doing this. One way I thought and tried is to fill the sliced images with black or white, position them over the background image, make their opacity 0, make them hit testable and assign a click handler.
Does this method have advantage over the previous one? Does making an image object transparent use less texture memory or is it the same?
And are there other better ways to do so? My main objective is about making the game use less texture memory and cutting the overall project file size by using less of those sliced images.
Use display.newRect/newCircle to mark down area, make them transparent and hit testable.
This should be more efficient than using images.
I am trying to build a UI for recording and playing videos.
I am using the GPUImage framework and would like to apply a mask filter and the GPUImageiOSBlurFilter to the camera.
Goal:
I am struggling with how to set everything up so that my input (camera) goes through unfiltered in the circle, but the blur filter is masked around the centre and applied to the camera output.
When I construct the chain like this:
[_camera addTarget:_maskFilter];
[_maskPicture processImage];
[_maskPicture addTarget:_maskFilter];
[_maskFilter addTarget:_blurFilter];
[_blurFilter addTarget:_screen];
The blur filter blurs everything in the view and the mask cuts out the video in all but the centre.
My Mask image is a black rectangle with a white circle.
Result:
How can I construct a chain of filters that help me achieve the UI in the picture above - I am looking for a nudge in which direction I should go. I am currently looking at GPUImageFilterGroups and the video buffer to try and "route" parts of my input around some filters, but I am having trouble finding resources.
You can do this fairly easily by modifying the GPUImageGaussianSelectiveBlurFilter.
Take the code for that filter and create a new filter based on it. In your new filter, replace the GPUImageGaussianBlurFilter with the GPUImageiOSBlurFilter. In the fragment shader, swap the sharpImageColor and blurredImageColor within the final mix() command . That should be it for replicating this effect.
The GPUImageGaussianSelectiveBlurFilter is a filter group that masks off and blurs things within a circle, and you want to invert that and use the stronger GPUImageiOSBlurFilter, so the above modifications will do that. This will be more performant than trying to apply a mask as a separate filter, and should be simple enough to implement.
I've created a canvas within which I display an image that is clipped when it goes over the edges. I can do this fine with a square shaped frame, however the frame I want to use is the one below. Is there any way I can clip the image inside the frame without having to add a non transparent square border around the image, i.e. just using the black line that I've already drawn? (on iPad)
You'll need to use Core Graphics and Quartz to handle this sort of clipping/graphics manipulation.
http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/Introduction/Introduction.html#//apple_ref/doc/uid/TP30001066
If you're using UIBezierPath, you may be able to achieve the clipping you're after using the following process
http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_paths/dq_paths.html#//apple_ref/doc/uid/TP30001066-CH211-TPXREF101
Convert your UIBezierPath to a CGPath
Get your image into a CGContext
Add your CGPath to the context via CGContextAddPath
Clip your context using CGContextClip
Alternatively, if you don't want to be messing with paths (and depending on whether this technique is suitable for your situation, your description of the issue makes it hard to tell), it might be worth using image masking to achieve the effect you're after. See the first link and look under "Bitmap Images and Image Masks".
I have been looking for the solution on the web for a long time. Most tutorials are fairly simple about adding shadow to a UIView. I also noticed that if we add a shadow to an UIImageView. The shadow shape could perfectly fit the shape of the content image if the image itself has alpha channel in it. Say for example, if the image is an animal with transparent background, the shadow shape is also the same as that animal (not a rectangle shadow as same as UIImageView frame).
But these are not enough. What I need to do is to add some changes to the shadow so it may have some rotation angle and compressed (squeezed or shift) effect so that looks like the sunlight comes from a certain spot.
To demonstrate what I need, I upload 2 images below, which I captured from the Google Map App created by Apple. You can imagine the Annotation Pin is an image which has the Pin shape, so the shadow is also "pin shaped", but it is not simply "offset" with a CGSize, you can see the top of the shadow is shifted right about 35 degrees and slightly squeezed the height.
When we tap and hold and pin, the shadow is also animated away from the pin, so I believe that such shadow can be made programmably.
The best shadow tutorial I can found so far is http://nachbaur.com/blog/fun-shadow-effects-using-custom-calayer-shadowpaths But unfortunately, that cannot make this effect.
If anyone know the answer or know any better words to search for, please let me know. Thank you.
(Please note that the shape of the image is dynamic in the App, so using any tool like Photoshop to pre-render the shadow is not an option.)
In order to create dynamic effects like this, you have to use Core Graphics. It's incredibly powerful once you know how to use it. Basically you need to set a skew transform on the context, set up a shadow and draw the image. You will probably have to use transparency layers as well.
It doesn't sound like you can use CALayer shadows, since that is meant to solve a specific use-case. The approach Apple takes with the pin marks on the map is to have two separate images that are created ahead of time (e.g. in Photoshop) and they position them within the map relative to a reference point.
If you really do need to do this at run-time, it should still be possible by using either Core Graphics or ImageKit. To get a blurred shadow appearance, you can use the kCICategoryBlur CIFilter. You can then convert the image to grayscale. And to get that compressed look you just need to resize and skew the image.
Once you have two separate images, you can either take the CGImageRef for the shadow image and can set that as the content of another sublayer, or you can add it as a separate view.
If you know what all the shapes are, you could just render a shadow image in Photoshop or something.