I am using react-three-fiber. I have multiple groups of meshes on my scene.
I want to achieve that upon interaction (mouse hover or click) I darken the scene except for the hovered mesh or group. This selection would change depending on what I hover over.
Is this best done through shaders or post-processing?
I've got meshbasicmaterials with baked image textures.
I am quite a noob, and I will have to learn how to do either way, but I need some pointers on which way is best to go.
Related
I try to implement a scene, where an object is updated in different way for each eye (eg. I want to project opposite rotation of box for each eye).
I have demo application written with WebGL using Three.js as described in Google Developers tutorial.
But there is only one scene, containing one mesh, with single update function. I can't find way to implement separation of update, so it's done seperately for each eye (just as rendering is done) and wonder if it's even possible.
Anybody has any experiences with similar case?
Your use case is rather unusual (and may I say, eye-watering), so basically the answer is no: Three.js has abstracted away the left/right eye dichotomy of VR. Internally it renders the scene using an array of 2 camera's, with the correct left/eye setting.
Fortunately, every object has an onBeforeRender(renderer, scene, camera, ...) event. If you hook that event, and find a way to distinguish the left/right eye camera you should be able to modify the orientation just before it gets rendered.
A (perhaps too) simple way to distinguish the camera's would be to keep a track of the index with a counter.
I'm trying to make a menu screen in which all the UI elements (buttons, text...) are completely dark and by touching the screen you create a fire (or just an area light) that makes the UI elements visible.
Sort of like this
I read that the default shader for the UI elements isn't affected by light, but i can't seem to change it.
How do I go about doing this?
The UI elements by default use a unlit shader and are also rendered directly to clip space. so you'll need to do two things, first put a lit shader onto the elements, the unity standard shader should do fine, then you should change the canvas render mode to world space. with the canvas in world space you can move it around like it was a sprite. i would also recommend creating a second higher priority camera for the UI with culling turned off. with the canvas in view of the UI camera, you should be able to place a light source near it and see the resulting lighting on the UI.
I have a cupboard with 9 boxes. On one of them I have animation, which open / close box. It is only change X coordinate of the box, but I can't apply this animation to another boxes, because animation will move it to the coordinate of the first box.
In the debug mode parameter Keep Original Position XZ are disabled. Can't understand, what is wrong.
Should I create 9 similar animations for 9 boxes?
I know that it is possible to animate stuffs using relative positions on the UI when using the anchors, but there does not seem to be any clean solution for 3D objects... This post offers what seem to be the "best" solution for now (it uses an empty parent transform to move the animated object correctly...)
You should be able to apply the animation to any object. I would recommend making a prefab of the "box" with the animation attached, then using the prefab for each. Honestly I don't have much experience with animations of 3D objects, but even my 2D animations are in a 3D space, and each object animates properly with the same animations individually regardless of their location.
I am using Unity3D, and I have a function which is being called inside of OnGUI to lay out the various gui components of my application. Ordinarily, the labels and buttons are all inside of a certain Rect that I supply, which is centered on the screen.
No problem there... however, what I want to is sometime render the exact same gui elements, which can be dynamic, and thus not just put into a prefabbed texture, into a trapezoid-shaped area off to the side, looking as if that gui were actually on a flat plane, pushed away from the center of the screen, and rotated slightly. All gui buttons that were drawn in the function should still respond normally.
I was rather hoping I could just specify some values in GUI.matrix to map the rectangle to a trapezoid, but my initial exploration seems to show that the gui elements don't appear to use homogenous coordinates, and everything still shows up as rectangular.
Is there any way to do this with Unity, ideally without requiring access to pro-only features?
Since now Unity3D GUI system isn't very flexible. The new GUI system is one of the features still not released in Unity 4 (we are all waiting for it).
From my point of view it has several problems, particularly:
You are forced to layout components using the flow of the code, instead of having a more declarative (or at least a more structured) way to do that.
It's quite inefficient (at least one draw call for button).
It isn't flexible at all. Add, Remove, Enable/Disable buttons can be come quick a painful operation when the number of buttons increase.
however, what I want to is sometime render the exact same gui
elements, which can be dynamic, and thus not just put into a prefabbed
texture, into a trapezoid-shaped area off to the side, looking as if
that gui were actually on a flat plane, pushed away from the center of
the screen, and rotated slightly. All gui buttons that were drawn in
the function should still respond normally.
This is quite hard if not impossible to obtain using Unity's GUI classes.
I see 2 possibilities:
Don't use GUI classes to do that. If your GUI is simple enough, you can implement your own (even 3d) buttons using for example:
A mesh (a plane or a trapezoid mesh) with a texture for the button background
TextMesh for drawing 3D text
RayCasting to check if a button has been pressed
Use a library that implements a more advanced GUI system like NGUI
When I ran into the same problem, I just used normal 3D GameObjects cubes with textures and called OnMouseDown(PC/Mac) or RayCasting(Android/iOS) on them. I guess that's how everyone does it.
I have 3 nice and puffy clouds I made in Photoshop, all the same size, now I would like to animate them so they appear like they were moving in the background. I want this animation to be the base background in all my scenes (menu,settings, score, game).
I'm using cocos2d, I have setup the menus and the buttons so the work but how do I accomplish this?
I was thinking to add this as a layer, any other suggestions?
Can anyone show me how some code how to make this please?
David H
A simple way to do it is with sine and cosine. Have slighly different parameters (period and amplitude) to ensure that the user doesn't realise (as easily) that they are programmatically animated.
You may also want to play with animating the opacity value. I'm not sure if layers have those, otherwise you'll have to add the clouds to separate nodes or images and applying it to them.
It's hard to be more specific without knowing what the images look like.
The simplest way to animate anything is to add the sprite to the scene, set the position and call something like...
[myClouds runAction:[CCMoveBy actionWithDuration:10 position:CGPointMake(200, 0)]];
This will slide the sprite 200px to the right over 10 seconds. As Srekel suggested, you can play around with some trig functions to get a more natural feel and motion paths, but you'll have to schedule a selector and iteratively reposition the elements.
The more difficult part of your questions is about getting the animation in the background of all scenes. Keep in mind that when you switch scenes, you're unloading one node hierarchy and loading a new one. The background cannot be shared. You CAN, however, duplicate the sprites and animation in all scenes, but when you transition between them there will be a jump.