I'm struggling with an issue that might seem a little bit awkward.
I have some black & white 2d animation (1440x1080px) that I'd like to be played in in a 3d environment in unity3d. Therefor I added a video player to a plane. Now comes the tricky part: I want to make the black areas of the video transparent while the white areas remain visible AND the white areas shall cast shadows on the surrounding. Using the particles shader "additive" does half of the job. But I just can't manage to let the video cast a shadow.
If it worked you would get some 2d "antagonist" (you can't interact with) that looks kind of 3d. Alternatively you could interprete it as some half materialzed holograph that casts shadows.
Is there any (simple) solution I just don't know?
Here some schematic drawing of what I would like to achieve, for better understanding.
The problem right now is: In contrast to my drawing, the desired shadow on the wall doesn't appear... :-/
So, I did never try this but you can maybe add a light in the scene just in front of the video player, that way the light will cast shadows.
Related
Ok so I've been trying to make a custom 2D lighting system in Unity, and I'm at that annoying stage where I know what I want to do but I'm not sure how to do it.
Here's the plan:
There will be dedicated light objects with their own meshes. These meshes determine the shape of the light.
Before the camera renders the whole scene, it does an extra render of just the light meshes with a black background to create a lightmap.
Then the camera renders the scene as normal (does NOT render the light meshes this time). Every object has a shader that will access the lightmap and shade itself appropriately depending on the color of the lightmap at that point.
That's the idea anyway. I sorta threw together a botched form of this. I used a separate camera to render the lightmap into a render texture with a culling mask so that it only rendered the light meshes, which are on their own layer. I then manually passed that texture to the shaders which use their screen uvs to sample from it.
This works sorta ok, but the scene view is completely messed up since it tries to light things as if you were looking at it from the perspective of the lighting camera. I feel like this would make the system hard to use, so I want to try to make some that feels a bit more cohesive.
Here's some screenshots to explain:
The tan-ish box is my "light," which gets rendered to the light cam, visible in scene. This next shot is what renders to the lightmap:
The black background is not from the big black box, the clear flag is just set to Black.
Now according to this lightmap, the middle of the screen should be lit up. and that's exactly what happens:
Notice that in the game view, since the light camera is set up with the same position/rotation/perspective settings as the game camera, it looks fine:
The main problem is figuring out that extra render. Is there anyway to create an extra pass for the main camera before the scene render that only renders the light meshes? I could probably figure out the rest from there. It would also be nice if I could make the lightmap a global shader variable, that way I don't have to pass it to each individual material, but one thing at a time, right?
Thanks so much to anyone who can shed some light on this subject. I'm still pretty new to shaders and rendering, so any help is much appreciated.
If I understand correctly, your problem is the appearance of your lights in Scene View, right ?
For that, you can create a custom Gizmos for them and hide the original objects. There's a tutorial:
https://learn.unity.com/tutorial/creating-custom-gizmos-for-development-2019-2#5fa30655edbc2a002192105c
I am making a game in Swift(SpriteKit) and when the character in the game picks up a power-up, I want him to get an outline in purple so the player can see that his power-up is ready to use. I want the outline to hug all the curves of the player exactly. Is there any way to draw an outline around a sprite node that isn't a basic shape(like circle or square) but to outline a complex shape?
Here is an example of a shape similar to my sprite node:
And here is another example of the player with the visual outline that I want to add in SpriteKit(I just sketched it but I want it to be exact obviously):
They player also has his legs animating by flipping through an atlas of the animation, and preferably the outline would stay around the legs when the walking animation is happening. Is this possible?
To be clear, I just want an outline for visual purposes, so the player knows their "power up" shield is active so if they get hit it won't damage them.
I haven't dabbled with SpriteKit for a few years, and if memory serves me correctly perfect collision detection while animating is not available out of the box.
After checking the documentation I see that SKPhysicsBody has a init(texture:size:) initializer. This should at least get you a bit closer.
This guide from Apple is probably worth a read. (Pixel perfect collision detection is expensive).
I am making a 2d game in the perspective of Terraria/Starbound. I want the lighting to look similar to this:
Ive tried to get lighting like this by adding a material on all the sprites in my game and then giving them a sprite diffuse shader. Then I made a point light wherever I needed light. There where two problems with this though: 1) Where the light was most intense, it was draining the color of a sprite and made it lighter. 2) I noticed a big FPS drop (And I only had 1 point light!).
Is there any way of achieving lighting like this without having to write my own lighting engine? Ive search the asset store and Ive searched to see if unity has any way of handing 2D lighting from this angle but I have found nothing.
If I do have to write my own lighting engine, would that be to complex for someone who is relatively new to unity and has only had ~ 8 months experience?
Assume you are using tile map.
You need to have a field of view map, which can be achieved by reading this: http://www.redblobgames.com/articles/visibility/
Using such map, you know exactly the color tinting for each tile. Now, just blend the color to the SpriteRenderer of every tile on the map.
Somebody already created a line of sight plugin:
http://forum.unity3d.com/threads/light-of-sight-2d-dynamic-lighting-open-source.295968/
Here's my hacky solution on GitHub
There's 2 cameras.
Empty tiles on the tilemap are filled in with white blocks (only one camera renders this)
A gaussian blur is applied to the camera rendering the white blocks
Then, blend the two cameras, darkening everything not covered by the white blur.
You can adjust the "light" penetration by changing the white tile's sprite's Pixels Per Unit.
I'm currently working on 3D insects in Unity, and I want to create a material that mimics the way the mantis or the damselfly eyes behave, especially the little black spot in the middle. For the moment I have a very fine material that makes everything I need, but the reflection cubemap I use for the blackspot is aligned with the world axes by default. Which means that the black spot will only move when I move the object, but in my project only the camera is moving.
Hence my question, is it possible to align the cubemap with the camera's axes, so that when I move the camera, the "front" of the cubemap stays in front of the camera, and so on?
PS: I haven't really messed with shaders yet, so perhaps I just need a line of code or something, please feel free to write it!
I'm working on an Android and iPhone app. I'm rendering lots of smallish (about 32 pixels) billboards to the screen for a particle system and want to give a glitter-like sparkle to each billboard e.g. as the particles are falling, random ones will briefly light up and sparkle as they catch the light. Is there a simple way to achieve this effect? As a limitation, I cannot use pixel/vertex shaders.
I was thinking something along the lines of a giving each billboard metal-like lighting effect (although I'm not sure how to do this part) coupled with giving each billboard a random and constantly rotating normal with flat shading so that each billboard would randomly light up. I'm having trouble making it look nice.
Disclaimer: I don't know OpenGL, and I did't actually try anything I write below.
You can have another, 'brightly lit', texture and substitute it when normal is nearly at the 'shine' position.
Take a piece of metal and rotate it. Once the normal is close to 'full shine' position, the metal shines a bit brighter, and a muted reflex travels through it, with a bright flash in the middle, then it is dull again.
If you can, apply a second bright texture of a narrow 'reflex' band and move it through surface of the billboards that are in a near-shine position, shifting them accordingly to normal angle. When the normal is at the shine position (± epsilon), apply the 'full shine' texture.
Also, unless your plates fly in vacuum, there will be a halo due to atmosphere. Add a rectangle say 50% bigger than the plate right behind it, and apply to it a semi-transparent halo texture that becomes fully transparent closer to edges. You only need it at the fill shine moment.