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我使用着色器创建一个天空， 又通过后期处理 EffectComposer outlinePass 和 GammaCorrectionShader， 我的天空着色器颜色由于我的后期处理而发生颜色变化
I use the shader to create a sky, and through post-processing EffectComposer outlinePass and GammaCorrectionShader, my sky shader color changes due to my post-processing
need not change sky color
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i am working on ionic framework based application
I have a demo project called CropImg that demonstrates cropping an image based on a user-selected rectangle. My app crops to an oval. It's written in Objective-C, but the technique is the same.
I know exactly zero about Ionic, so I can't help you there.
The abstract shapes you show in your image would be more complicated. You would need to create an editor that let the user draw those more complex shapes. I suggest looking into Catmull-Rom splines. Those are curved shapes that go through all the control points (Bezier paths, the usual curve used in computer Graphics, have control points that do not lie on the curve and they are not super-intuitive to set up.)
Erica Sadun's excellent iOS Developer's cookbook series has a receipe that shows how to create Catmull-Rom splines
EDIT:
Actually, looking closely at the 3rd frame in your image, it appears there are Bezier control points on the image, so maybe you DO want bezier curves. Creating a UI for letting the user draw a multi-part cubic bezier curve is going to be quite a bit of work.
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i'm crazy about plants and i'd like to make a small widget for my desktop to simulate a plant which would grow in realtime .
The fact is i'm not that good at designing algorithms and i don't know where to start to be able to simulate my plant growth from the seed to an adult plant.
the simulation should be able to generate branch, section and finally flower.
I would like to start with a very common plant such as a geranium .
i plan to develop it in JS with threejs ( threejs.org )
You could draw some inspiration from the fibonacci sequence.
Vi Hart has a really nice video on this topic (3 video series):
http://www.youtube.com/watch?v=ahXIMUkSXX0
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As part of a water quality survey we need to display, color coded, the water quality of a river segment. We measure the water quality along the river at multiple coordinates, and we need to display the river with different colors between two consecutive measuring points.
Is this possible using the Google Maps API (or Bing, Openstreetmap, ...)?
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How to make a path-based animation with
paper.js E.G bezier curve.
I am creating a project that will allow you draw a canvas path and then animate anything else you draw along the path and then export the code for use in your own projects. Paths are built from joining cubic Bezier curves. A first version is available at http://canvimation.github.com/ with source code at https://github.com/canvimation/canvimation.github.com and help files at https://sites.google.com/site/canvimationhelp/.
I am currectly rewriting the code to make it more understandable and robust (stage 1 branch) but have not got to rewriting the animation sections yet. If any of the code is useful to you then you are welcome. Probable useful files are alongpath.js and buildmenu.js
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Which 3d surface chart library out there do you recommand? It is ok if it is flash or silverlight, as long as it supports dynamic data update thru json.. Thank you!
Gil.
How about javascript-surface-plot?
As for javascript not being fast enough, what do you think this is, 2009?
I am not entirely sure what you are after but one option for 3D charting with Javascript would be Canvas 3D Graph
Edit
Surface plotting is quite CPU-intensive and requires a good graphics API, so Javascript doesn't cut it.
Unfortunately there aren't any ready-made 3D charting libraries for Flash or Silverlight that support surface plotting, only a couple of 3D engines, for example Away3D.
If you are willing to go with applets then JFreeChart might help you (JFreeChart in an Applet). You can control the applet with Javascript and feed it whatever data necessary.
Jmol is used in SAGE for 3D graph plotting. It runs as an applet. It is quite heavy-weight, and it even has a console. Check out the SAGE sources for usage.