orthographic

问题 I am drawing a triangle in OpenGL like: MyGLRenderer( ) { fSampleVertices = ByteBuffer.allocateDirect( fSampleVerticesData.length * 4 ) .order ( ByteOrder.nativeOrder( ) ).asFloatBuffer( ); fSampleVertices.put( fSampleVerticesData ).position ( 0 ); Log.d( TAG, "MyGLRender( )" ); } private FloatBuffer fSampleVertices; private final float[] fSampleVerticesData = { .8f, .8f, 0.0f, -.8f, .8f, 0.0f, -.8f, -.8f, 0.0f }; public void onDrawFrame( GL10 unused ) { GLES30.glViewport ( 0, 0, mWidth,

问题 I am trying to create spinning globe with bars like in this example. You can see my example here. And everything goes fine until bars go over horizon. I have no idea how to cut bars from the bottom when they on other side of planet. Anybody can suggest me how to do it? /* * Original code source * http://codepen.io/teetteet/pen/Dgvfw */ var width = 400; var height = 400; var scrollSpeed = 50; var current = 180; var longitudeScale = d3.scale.linear() .domain([0, width]) .range([-180, 180]); var

问题 I am trying to create spinning globe with bars like in this example. You can see my example here. And everything goes fine until bars go over horizon. I have no idea how to cut bars from the bottom when they on other side of planet. Anybody can suggest me how to do it? /* * Original code source * http://codepen.io/teetteet/pen/Dgvfw */ var width = 400; var height = 400; var scrollSpeed = 50; var current = 180; var longitudeScale = d3.scale.linear() .domain([0, width]) .range([-180, 180]); var

问题 I am trying to create spinning globe with bars like in this example. You can see my example here. And everything goes fine until bars go over horizon. I have no idea how to cut bars from the bottom when they on other side of planet. Anybody can suggest me how to do it? /* * Original code source * http://codepen.io/teetteet/pen/Dgvfw */ var width = 400; var height = 400; var scrollSpeed = 50; var current = 180; var longitudeScale = d3.scale.linear() .domain([0, width]) .range([-180, 180]); var

问题 I am trying to create spinning globe with bars like in this example. You can see my example here. And everything goes fine until bars go over horizon. I have no idea how to cut bars from the bottom when they on other side of planet. Anybody can suggest me how to do it? /* * Original code source * http://codepen.io/teetteet/pen/Dgvfw */ var width = 400; var height = 400; var scrollSpeed = 50; var current = 180; var longitudeScale = d3.scale.linear() .domain([0, width]) .range([-180, 180]); var

问题 I'm trying to understand how to use camera with usesOrthographicProjection = true . I need to set it up so when we first see the scene, the object should be viewable in full. I used the Xcode's SceneKit template, adjust a little bit about the camera (all the code is in viewDidLoad ). Using default camera (perspective projection), it looks like this: cameraNode.position = SCNVector3(x: 0, y: 0, z: ship.boundingBox.max.z + 20) Next, I tried to set the orthographic projection, now it looks like

问题 I'm trying to figure out how to draw graphics in XNA, and someone else suggested this. But before I attempt to use this... If I create and use this camera, and set LEFT,TOP to 0 and WIDTH=256 and HEIGHT=240, anything I render to the screen will use these coordinates? So a box with a width and height of 1, if set to 0,0 will take up space from 0,0 to 1,1? 回答1: The function you are referring to is: Matrix.CreateOrthographicOffCenter(left, right, bottom, top, zNearPlane, zFarPlane) . This

问题 I am trying to draw circles at a given geographical coordinate with a certain radius using cartopy. I want to draw using an orthographic projection, which is centred at the centre of the circle. I use the following python code for testing: import numpy as np import cartopy.crs as ccrs import cartopy.feature as cfeature import matplotlib.pyplot as plt import matplotlib.patches as mpatches # example: draw circle with 45 degree radius around the North pole lon = 0 lat = 90 r = 45 # find map

问题 I am trying to draw circles at a given geographical coordinate with a certain radius using cartopy. I want to draw using an orthographic projection, which is centred at the centre of the circle. I use the following python code for testing: import numpy as np import cartopy.crs as ccrs import cartopy.feature as cfeature import matplotlib.pyplot as plt import matplotlib.patches as mpatches # example: draw circle with 45 degree radius around the North pole lon = 0 lat = 90 r = 45 # find map

问题 I have a shapefile of world countries, downloaded from here. I can plot it in R using countries <- readOGR("shp","TM_WORLD_BORDERS-0.3",encoding="UTF-8",stringsAsFactors=F) par(mar=c(0,0,0,0),bg=rgb(0.3,0.4,1)) plot(countries,col=rgb(1,0.8,0.4)) Now I wanna plot it in orthographic projection (Earth seen from outer space), so I'm trying countries <- spTransform(countries,CRS("+proj=ortho +lat_0=-10 +lon_0=-60")) I also played with the x_0 and y_0 parameters (as stated here), but I always get