I've created following scene:
What you see is the light shining through a window to the back wall of the room. Outside is a tree blowing in the wind. What I'm trying to simulate it a stormy weather, so I need to add rain to the scenery as well. However, I just need it as a shadow through the window. How is this done, can it simply be done through Unity's Particle System, or do I need shader etc.?
Use particle system, it has Renderer Module where you can play around with material/texture/shader to get the desired result.
I would go for a grey/black colour to make it look like a shadow
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 m wondering that if is it possible to animate anything along the rules of physics.
I mean, i have a cube, and two legs attached to that cube. I want to just animate that legs one after each other, but unity or other software will force its animation system to behave to my animated legs to make my cube walk. I wont change positions for my body(cube) but legs will do that.
demonstration:
https://streamable.com/dda610
Yes, this animation type is called procedural animation. You base your animations dynamically based on physics.
https://en.wikipedia.org/wiki/Procedural_animation
good video:
https://www.youtube.com/watch?v=LNidsMesxSE
tutorial:
https://www.youtube.com/watch?v=9Wh6fzSl_u8
Physically based animation is a complex task. You can use the timeline to animate legs but they won't work too well physically. You probably want to use code to keep the body a fixed height above the surface and use the timeline editor to animate the legs. Or perhaps keep the body at the same height and use 'inverse kinematics' to move the legs in a more realistic fashion. Neither of these options will be very quick for you to start using really effectively if you have very little experience with unity or with code but knowing what to look up is half the battle of learning.
I'm making a 2D sandbox game like "Terraria" and "Starbound". This is my game
The light is filling the whole terrain but i don't want it. I want following:
You're probably using Directional Lighting, which illuminates the whole terrain equally in the direction you made it.
You could use Spot Lights or Point Lights, which will illuminate only the surface you want to.
Edit: although using this method, this could take way more resources due to the number of single lights placed throughout the map.
I'm making a FPS game in Unity, and I want the environment to light up as the player is shooting on his environment.
So say I have a tree. First it would be entirely black or greyish, but if I shoot somewhere, I would see some green.
To accomplish this feature, I'm using a raycast to have the impact point and so I can access any renderer of the point that the player is shooting on.
I guess the next step would be to write a custom shader to light the exact pixel that is shot.
Do you have any idea how I could write this shader or another way of doing this effect?
Regards
If you are using deferred rendering: Deferred decals.
If you are using forward rendering: Projectors.
If you need some more advanced "paint-like" functionality, use render textures coupled with RaycastHit.textureCoord to get the exact UV coordinate at your ray intersection point. You can draw stuff to render textures using Graphics.Blit. Check out this github project for some inspiration on how to do this.
In older games Ive made levels in, like unreal or half-life the skybox is a parallaxed texture that you assign to world geometry, for instance, the ceiling of your room, to give the illusion of the room being open to the sky.
There are some neat tricks or weird things you can achieve with this 'sky portal' method. For example you could have 'sky' in an underground room. or walk through a hole in the sky.
I'm wondering is it possible to make a mesh in unity3d render as part of the skybox like in these older engines.
You can do this yes. Usually you assign a "SkyBox" to your camera and change the "Clear Flags" for her "SkyBox". However, there are other ways to do.
Learn more here: http://docs.unity3d.com/Documentation/Components/class-Skybox.html
Hope this help !