I have plotted a cylinder at some latitude/longitude and altitude with certain radius and height for the cylinder.
I have then plotted a image using billboard. The position of the image is inside the cylinder already plotted. The image comes behind the cylinder. Is it any way to plot the image above the cylinder just like z-index property in CSS.
Thanks in advance.
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I have two endpoint of a line segment. I calculated the pixels to be colored using Mid Point Line algorithm. Now, I want to apply unweighted antialiasing to those pixels which provides the intensity of a pixel based on the area overlapping of that pixel and line.
I am asking for suggestions on how to find out those percentage of overlapping area?
It is not necessary that pixels are to be considered as rectangle only.
When I want to draw a pie chart in SVG, all tutorials say that you need to calculate the end point of the arc element. Unless you want an exact 90° angle, that calculated point must unvariably fall beside the circumference line of the underlying circle because of rounding, if you scale up the scalable (!) graphic.
I cannot believe there is no way to draw a circle segment by giving a center, a radius and an angle.
Or is there?
I have images with unequal resolution in x and y direction. The pixel height is larger than the pixel width. The pixel width and pixel height are saved in Image > Properties.
When I draw an ellipse on the image and try to use the Analyze > Measure tool I get a '0' for both major and minor axis length for the "Fit ellipse" measurement.
I can only get a proper measurement if I remove the scale of the image, or manually change the pixel height and pixel width to an equal number.
I assume this is a bug, but maybe I'm missing something?
As a workaround I was thinking of writing a small macro that saves pixel height and pixel width, then removes the scale of the image, then measures major and minor axis length in pixel and then re-applies pixel height and pixel width to the measurements.
But I can't find the command for reading out the resolution. Any pointers?
The documentation for the Set Measurements... command states in the description of the Fit ellipse parameter:
Note that ImageJ cannot calculate the major and minor axis lengths if
Pixel Aspect Ratio in the Analyze▷Set Scale… dialog is not 1.0.
Your workaround should work, just use the getPixelSize(unit, pixelWidth, pixelHeight) macro function.
How can I calculate object bottom position?
I created an object and a plane, both in (0,0,0) position, but the model geometrical center is placed in that point, not the bottom face of it, in result, the plane is clipping the half of it, see the demo: http://www.edar.com.pl/test-3d-3/
I'd like my models to have the same height when I place them on the screen. Also I want them all to intersect the shadow plane with their bottom parts, so I guess I have to calculate their heights and move them via object.position.y = obj_height/2; ?
Check Three.GeometryUtils.Center() - function which centers the geometry of an object.
So you could copy and modify the function to your liking to center the geometry at the bottom center.
Also you could also iterate over all vertices and just add or remove an offset-vector.
As an input, I receive some planar, triangulated geometry. Now, I need to compute the four coordinates of the corners of the bounding rectangle. Any Ideas?
I'm going to assume that you mean 2D space in the question title, because everything else refers to 2D.
Go through all the vertices (x,y) in your geometry, and calculate the maximum and minimum of the x's, and the max and min of the y's.
Then the vertices of your bounding rectangle will be (min_x,min_y), (max_x,min_y), (max_x, max_y), and (min_x, max_y).