I have some scene in three.js with static objects like solid cubes and so on.
Over this objects I have place some quads each of them is textured with letter image.
When I activate fxaa postprocessing main objects looks fine but letters textures looks not good - blurry and dirty. I think it's because letter texture already antialiased. I can't generate another type of textures because Chrome render font already antialiased and I just get screenshot for texture.
Is it possible somehow exclude some objects from fxaa pass? Maybe make more render passes? Any ideas or samples?
Thanks.
Related
I'm trying to render texture to material but it rendered is not correctly, maybe my texture is wrong, but when i add the texture in blender it renders correctly. I don't know why.
Sorry I just learned threejs, but the current project needs to render in 3d. So I came here to ask if anyone has a solution, please help me.
Here is my Codesanbox:
https://codesandbox.io/s/hero-kdhox?file=/src/App.js
The texture I have added in Blender something like this:
https://imgur.com/dYkD5u8
You must flip your textures vertically, threejs will by default flip them when you import them using 'useLoader' there is a property flipY for textures but it hasn't been working reliably
Your best bet is to flip them vertically manually before importing
Alternatively, pack the textures in your GLB on blender itself
I have created a simple human figure. The eyelashes use a texture with transparency.
However as soon as I turn on transparency for the face texture there is created transparency where it shouldn't be.
You can look through the face texture in the part that lies below the eye lashes.
See the effect by toggling face transparency with this line:
mesh.material.materials[3].transparent = false
mesh.material.materials[3].transparent = true
I wish to have transparency turned on for the face texture, so how can I solve this problem?
Demo:
http://dev.udart.dk/transparencyProblemStackOverflow/
(wait for model to load)
Code:
https://github.com/vibber/transparencyProblemStackOverflow/blob/gh-pages/index.html
Transparent geometry gets manually depth-sorted, for more information see this canonical answer by Toji: Transparent textures behaviour in WebGL.
If you want this scenario to work properly, you'll have to split up your model, and render the eyelashes as a separate (sub)mesh. This way three.js can render the rest of the face using the normal z-buffer approach, then apply the eyelashes separately (from the depth-sorted transaprent objects queue).
I am working on a simple painting app using LibGDX, and I am having trouble getting it to "paint" properly with the setup I am using. The way I am trying to do this is to draw with sprites, and add these individual sprites into a background texture, using LibGDX's FBO commands, when it is appropriate.
The problem I am having is something relating to blending, in that when the sprites are added to this texture that I am building, any transparent pixels of the sprite that are on top of pixels that have been drawn to previous will be brightened up substantially, which obviously doesn't look very good. The following is what the result looks like, using a circle with a green>red gradient as the "brush". The top row is part of the background texture now, while the bottom one is still in its purely sprite drawn form.
http://i238.photobucket.com/albums/ff307/Muriako/hmm.png
Basically, the transparent areas of each sprite are brightening anything below them, and I need to make them completely transparent. I have messed around with many different blending mode combinations and couldn't find one that was any better. GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA for example did not have this problem, but instead the transparent pixels of each sprite seem to be lowered in alpha and even take on some of the color from the layer below, which seemed even more annoying.
I will be happy to post any code snippets on request, but my code has become a bit of mess since I started trying to fix these problems, so I would rather only put up the necessary bits as necessary.
What order are you drawing the sprites in? Alpha blending only works with respect to pixels already in the target, so you have to draw all alpha-containing things (and everything "behind" them) in Z order to get the right result. I'm using .glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
I would like to play around with testing a 3D map, of sorts. At it's simplest, one flat pane, with map lines etc. drawn onto it, flat (as if I was drawing onto an HTML canvas). But I want that pane to be movable in 3D space.
I know that I can make a flat pane in three.js very simply, but is it possible to implement some sort of 'custom texture' that would allow me to programmatically draw onto this pane?
It is called render-to-texture in webGL.
Three.js provides WebGLRenderTarget which can be used as image source for further textures. You render your scene to WebGLRenderTarget instead of main WebGL screen. Then you use this WebGLRenderTarget as image source for the texture.
A lot of 2D post-processing works like this. They render the world to 2D texture, then use fragment shaders to apply per-pixel postprocessing code, like blurring.
For examples, see e.g. http://mrdoob.github.com/three.js/examples/webgl_postprocessing.html
It renders the scene for 2D postprocessing, but the theory is the same.
Here is the WebGLRenderTarget setup code:
https://github.com/mrdoob/three.js/blob/master/examples/js/postprocessing/EffectComposer.js#L14
I am trying to make a 3d car race in iphone using OPENGL ES 1.x.
I do not know how to draw the background sky in my scene. I tried using only planes for background but where should i placed that plane? I mean if i placed that plane outside the whole track then the frustum is not so big to show that planes in the scene.
Any suggestions will be of great help.
You can make a small skysphere or box, as suggested by Davido and turbovonce's link, which is centered around the viwer and fits into the frustum. You draw this first, without writing into the depth buffer. Then you draw the other stuff and as the skybox has not written to depth buffer it is just overwritten, except the parts where no scene objects are rendered, which are exactly the parts of the image where the sky should be visible.
You want a sky dome. Take a look at this website, it contains tons of references that should help you.
http://www.vterrain.org/Atmosphere/
Create a sphere in a 3d modeling app such as Maya or Blender and map a sky texture to the sphere. Export the model then load the model and its texture into the app, place in the scene. You should now have a background sky rendering in your game.