3d

Multithreading RayTracer generating artifacts with two different algorithms

由 穿精又带淫゛_ 提交于 2020-01-06 14:26:07
问题 I have been trying to implement multithreading with my RayTracer, but I am experimenting strange artifacts related to MT. Now I am sure that is not algorithm related, because its happening with two different approaches. Bellow is what happening with a MT algorithm where the first thread takes care of the lower half of the image and the other the top half. In first case I send the thread0 to return before doing anything, in the second case, the thread1 returns. Working as expected. Now with

Highchart 3d: Chart graph. Zaxis alignment issue

由 断了今生、忘了曾经 提交于 2020-01-06 07:24:15
问题 I am working on a 3d scatter plot chart. But facing issues with setting up the position of z axis label. Kindly help me in getting it back in proper position. Thanks in advance. I tried to play around with the zaxis values but no luck. zAxis: { min: 0, max: 11, gridLineColor: 'white', categories: ['W', '1', '2', '3c', '3b', '3a', '4c', '4b', '4a', '5c', '5b', '5a'], labels: { y: 1, rotation: 30, align: 'center' } } JS Fiddle link : http://jsfiddle.net/suprcool01/xvdcqbyk/24/ 来源： https:/

Find 3d coordinates of a point on a line projected from another point in 3d space

由 戏子无情 提交于 2020-01-06 05:45:07
问题 Working in Swift, ARTKit / SceneKit I have a line AB in 3d and I have xyz coordinates of both points A and B. I also have a point C and I know its xyz coordinates too. Now, I want to find out the xyz coordinates of point D on line AB; given that CD is perpendicular to AB. What would be a simple way to do it in Swift. 回答1: Parameterize the line AB with a scalar t : P(t) = A + (B - A) * t` The point D = P(t) is such that CD is perpendicular to AB , i.e. their dot product is zero: dot(C - D, B -

Custom chart based on Q3DScatter with QCustom3DItem going slow

由 自闭症网瘾萝莉.ら 提交于 2020-01-06 05:36:07
问题 I want to make a 3D chart with bars, the bar color depends on its size. Both Qt bar and scatter graph types are close to what I'm looking for. I ended up creating a chart based on Q3DScatter and adding QCustom3DItem to draw the bars, so I can set a mesh item and color to each item. I have one item in each position of the chart. Let's say it's a 100x100 chart, meaning there are 10 000 bars (custom items). I want to redraw the entire chart multiple times per second. By redraw I mean every item

css3 2d/3d变换重点属性详解

由 老子叫甜甜 提交于 2020-01-06 04:45:48
css3 2d/3d变换——实现超炫的特效 声明：所有结论都是经过实际代码运行的效果证实的，如果有不同的情况发生，请核对浏览器版本以及内核（360浏览器，webkit内核）是否与本人试验的时候一致，同时非常感觉读者阅读本文，如有错误之处，欢迎大家留言指出。 css3的2d/3d变换是一个很强大的功能，以前想要做到图片的倾斜或者旋转某个角度，都无法简单的做到，更别说3d效果的实现，这里的3d效果其实也是一种2d变换之后给人的一种视觉欺骗达到的，浏览器这个“平面”客户端确实无法做到真正的3d效果，现在css3就给我们提供了一种简单的方法来做到2d/3d效果。下面我给大家分享一下我的学习心得。 一、坐标轴和参考点（旋转基点） 1、参考点（旋转基点） 相信大家对于参考点这个概念并不会陌生，见名知意的一个词语，css的参考点就是元素所围绕其旋转的点，在css中用一个属性设置旋转基点，如下所示： transform-origin: left top; // 设置该元素的旋转基点为该元素的左上角 transform-origin 属性是css变换的一个重要的属性，一般需要设置2个值： 第一个值为偏移x轴方向的距离，可以用关键字left|right|center或者百分比以及具体的距离值描述。 第二个值为偏移y轴方向的距离，可以用关键字top|bottom

compute slope of a 3D plane

由 ≯℡__Kan透↙ 提交于 2020-01-06 04:27:10
问题 I have a set of (X,Y,Z) points representing different planar features. I need to calculate the slope of each plane using normal vectors. i think slope is given by the angle between normal vector (NV) of each plane and NV of imaginary horizontal plane. Assume, the plane equation that I use is; Ax+By+c=z. Then i guess the normal vector of my plane is (a,b, -1). For my plane equation, what should be the equation of imaginary horizontal plane? I think equation of horizontal plane is z=c. Hence,

AS3- create a loopable random path in 3D space

由 柔情痞子 提交于 2020-01-06 04:12:05
问题 I'm trying to optimize a 3d demo by populating a lookup table with 3d points(Vector 3D http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/geom/Vector3D.html) which I will then access later on. These 3D points will define a random and loopable path in 3D space. Does anyone know a way of achieving this? I was thinking modifying the Greensock Bezier tween to create a bezier in 3d space, and then somehow grabbing the xyz values of the resulting tween. 回答1: Ok, you'll need to

Why excatly shouldn't I use LibGDX's createBox or createRect?

由 烂漫一生 提交于 2020-01-06 04:10:26
问题 I'm currently in the process of creating a voxel engine in order to familiarize myself with many of the concepts involved, It also happens to be an exercise in optimization for me. When searching around I've seen multiple sources across several websites suggust that I not use ModelBuilder().createBox() or createRect() to do anything but troubleshooting. Instead they recommend creating your own cube models in something like blender, than using those in place of createBox. I've just finished

Rotating a 3d polygon into xy-plane while maintaining orientation

由 我的未来我决定 提交于 2020-01-06 04:00:08
问题 I have a polygon oriented any way and positioned anywhere in 3d space. I need to transform the polygon into the xy-plane so that I can perform various operations on it (in particular generating a grid of points across the bounding box of the polygon) in 2d rather than 3d, then transform it back. The problem comes with the orientation of the transformed polygon. If I just wanted to rotate into the plane, I could take the angle between the polygon's normal and the xy-plane and rotate around an

How to intercept touchscreen events in Android OpenGL ES?

由 喜夏-厌秋 提交于 2020-01-06 03:54:04
问题 How exactly do you intercept touchscreen events for OpenGL ES games in Android? Also, if the game is 3D, how do you know if the user touched an object in the background? Thanks. 回答1: Override onTouchEvent(MotionEvent e) into your class extending GlsurfaceView. @Override public boolean onTouchEvent(MotionEvent e) { float x = e.getX(); float y = e.getY(); switch (e.getAction()) { case MotionEvent.ACTION_MOVE: float dx = x - mPreviousX; float dy = y - mPreviousY; mRenderer.mAngleX += dx * TOUCH
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