I have a lot of different images in feed, that should be looking like this
http://s014.radikal.ru/i327/1603/14/97b12afe691f.png
In Sketch it s done by mask with RadialGradient. So i tried this way, but:
if i add a layer with gradient above, image is not transparent
if i redraw image with Quartz - i get lags and it is not transparent as it should be
I know it should be easy. Really easy. Please, someone - give me a clue!
Here is my gradient:
let colors: [CGFloat] = [ 88/255, 176/255, 113/255, 0.64, 90/255, 125/255, 113/255, 0.17, 88/255, 92/255, 110/255, 0.01]
let gradient = CGGradientCreateWithColorComponents(baseSpace, colors, [0.0, 0.7, 0.85], 3)
CGContextDrawRadialGradient(context, gradient, center, 10, center, self.size.width/2, .DrawsAfterEndLocation)
Create a CALayer the same size as your image. Draw your gradient into an image and install that CGImage as the contents of the layer. Them make the layer the mask of your image view's layer.
Take a look at my development blog entry ImageViewWithMask for a working example of using mask layers in Swift. (In my example I use a CAShapeLayer to draw a hard-edged mask. You will need to adapt it to use a gradient instead).
You should be able to use a CAGradientLayer, but those don't look like they support radial gradients. They have a gradient type property, but the only supported type appears to be Axial, which is silly.
Related
I Have hexagon sprites over Image and in back my screenshot image but Here, problem is my image shape square but i want try to fix in hexagon shape
So what i do ? please give me any suggestions
frame without image:
frame with image:
You can have a look at the following blog post:
https://subscription.packtpub.com/book/game_development/9781785885822/1/ch01lvl1sec13/adding-a-circular-mask-to-an-image
Basically, you create your hexagon shape in, for example, Gimp, fill it with white color and leave the rest transparent. Be sure to add the alpha channel to your layer. Export as a PNG and apply it to your sprite with the correct unlit transparent shader.
Create UI Panel And ADD COMPONENT
Image
Mask
In Image Component You set Your Any Shape's Image
And Also Add One Image Into Panel That you mask in this Shape
Check it out for more information https://youtu.be/g3gpXmo8zRo
I have an image that is generated as an NSImage, and then I draw it into my NSView subclass, using a custom draw() method.
I want to modify this custom view so that the image is drawn in the same place, but it fades out on the side. That is, it's drawn as a linear gradient, from alpha=1.0 to alpha=0.0.
My best guess is one of the draw() variants with NSCompositingOperation might help me do what I want, but I'm having trouble understanding how they could do this. I'm not a graphics expert, and the NSImage and NSCompositingOperation docs seem to be using different terminology.
The quick version: pretty much this question but on macOS instead of Android.
You're on the right track. You'll want to use NSCompositingOperationDestinationOut to achieve this. That will effectively punch out the destination based on the alpha of the source being drawn. So if you first draw your image and then draw a gradient from alpha 0.0 to 1.0 with the .destinationOut operation on top, you'll end up with your image with alpha 1.0 to 0.0
Because that punch out happens to whatever is already in the backing store where the gradient is being drawn to, you'll want to be careful where/how you use it.
If you want to do this all within the drawing of the view, you should do the drawing of your image and the punch out gradient within a transparency layer using CGContextBeginTransparencyLayer and CGContextEndTransparencyLayer to prevent punching out anything else.
You could also first create a new NSImage to represent this faded variant, either using the drawingHandler constructor or NSCustomImageRep and doing the same image & gradient drawing within there (without worrying about transparency layers). And then draw that image into your view, or simply use that image with an NSImageView.
Hello i am new to ThreeJS and texture mapping,
Let's say I have a 3D-Plane with the size of (1000x1000x1). When I apply a texture to it, it will be repeated or it will be scaled, to atleast filling the full plane.
What I try to achieve is, to change the scaling of the picture on the plane at runtime. I want the Image to get smaller and stop fitting the full plane.
I know there is a way to map each face to a part of a picture, but is it also possible to map it to a negative number in the picture, so it will be transparent?
My question is:
I UV-Mapped a Model in Blender and imported it with the UV-Coords into my ThreeJS-Code. Now i need to scale the texture down, like described before. Do I have to remap the UV-Cords or do i have to manipulate the image and add an transparent edge?
Further, will I be able on the same way to move the image on the picture?
I already achieved this kind of usage in java3d by manipulating bufferedImages and drawing them onto transparent ones. I am not sure this will be possible using javascript, so i want to know if it is possible by texture-mapping.
Thank you for your time and your suggestions!
This can be done using mapping the 3d -plane to a canvas ,where the image is drawn (fabric.js can be used for canvas drawings).Inshort set the canvas as texture for the 3d model
yourmodel.material.map = document.getElementById("yourCanvas");
Hope it helps :)
Yes. In THREE, there are some controls on the texture object..
texture.repeat, and texture.offset .. they are both Vector2()s.
To repeat the texture twice you can do texture.repeat.set(2,2);
Now if you just want to scale but NOT repeat, there is also the "wrapping mode" for the texture.
texture.wrapS (U axis) and texture.wrapT (V axis) and these can be set to:
texture.wrapS = texture.wrapT = THREE.ClampToEdgeWrapping;
This will make the edge pixels of the texture extend off to infinity when sampling, so you can position a single small texture, anywhere on the surface of your uv mapped object.
https://threejs.org/docs/#api/textures/Texture
Between those two options (including texture.rotation) you can position/repeat a texture pretty flexibly.
If you need something even more complex.. like warping the texture or changing it's colors, you may want to change the UV's in your modeller, or draw your texture image into a canvas, modify the canvas, and use the canvas as your texture image, as described in ArUns answer. Then you can modify it at runtime as well.
i am trying to cast an shadow on an totally transparent plane in SceneKit on OSX. I am struggling with this problem since several hours and do not come to any solution.
My Purpose is to generate an Screenshot of several objects with an transparent background and just the shadow on an invisible Plane.
Do you have any suggestions for me how i can make this with apples SceneKit?
Do i have to program my own shader, can i make this work with shadermodifiers or can i use built in functionallity?
UPDATE:
I find an alternative solution for anyone who needs:
create a white plane under 3D model, note that the color of plane must be pure white.
set blend mode of plane's material to SCNBlendModeMultiply.
set light model of plane's material to SCNLightingModelLambert.
This works because any color multiply white color (1, ,1, 1) return itself And lambert light model will not take account of directional light, So the plane will always be background color which look like transparent. Another benefit of this solution is you don't need change light‘s shadow rendering mode.
For people who used to inspector of Xcode.
According to SceneKit: What's New.
First, add a plane under you model. Then prevent it from writing to colorBuffer.
Second, change your light model's shadow rendering mode to deferred. Notice that you must use light which can cast shadows.
Oily Guo, your solution works. Here the solution is in code:
Configuration of the light source:
light.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
light.shadowMode = .deferred
And for the floor (ie. SCNFloor underneath your objects):
material.diffuse.contents = UIColor.white
material.colorBufferWriteMask = SCNColorMask(rawValue: 0)
I do not have an answer to your question, however I have a workaround:
Render your scene and keep the image in memory
Change all the materials in your object for pure black, no specular
Change the plane and the sky to a fully white material, lights to white
Render the scene to another image
On the second image, apply the CIColorInvertand CIMaskToAlpha Core Image filters
Using Core Image apply the Alpha Mask to the first render.
You'll get an image with a correct Alpha channel, and transparent shadows. You will need to tweak the materials and lights to get the results you want.
The shadow may become lighter on the edges, and the only way around that is rendering it as yet another image, and filling it with black after the Mask to Alpha step.
How to spread color Top to Bottom using CCTintTo method in sprite.
Because i am using CCTintTo method to spread color in sprite. But i want to look like spreading color in top to bottom.
What to do for this types of animation.
Thanks in advance.
If you are using cocos2d 2.0+, you could write a shader to do this, and set the shaderProgram property of the sprite. Not that hard, follow the examples in the distribution. My first shader took me .5 work days to get to work, and maybe another .5 workday to properly integrate that technique properly in my overall software architecture. g'luck :).
Look here for an introduction to shaders, play with it in a side project until you are comfortable to integrate in your main trunk.
That's not possible with color tinting. Changing a node's color property or using the tint actions will only tint the entire sprite with a single color, there will be no gradient.
You would have to custom draw the sprite and apply/adapt the gradient rendering code from CCLayerGradient.
Yes CCLayerGradient is what you are looking for.By the way what technique you are using for coloring.If you are using CGContextSetRGBFillColor method to fill the sprite color then it would be tricky but if you are using images to fill color then nice sequence of images plist can be used to produce animation which will give you the exact effect you are looking for.
Take the sequence of images and animate them using CCSpriteBatchNode otherwise if you want to use RGB colors to fill sprite then you have to look for gradient effect.