Does anyone have a ready made snippet that will map a square image to a four sided polygon

examples would be awesome and it doesn’t need to be “real” time… I just need to make a series of static images

Dave, I would like to try to think about your problem, but I still don’t urdestand what you want to get from the image (most probably because of my english) . Would you mind explaining it in some other way? Maybe you could say what you would get in that particular example. One question, are those …

the colors are for illustration only… to denote where exactly the 3 images need to be mapped to… So given 3 PNG images … map one each to the areas of color in the diagram the end result would be a “3D cube” with textured faces. I could go to the trouble to do this with SpriteKit… but these are st…

Ok, thanks for the explanation. Your magenta square image needs to be rotated 45 º around the center point and then the vertical dimension needs to be scaled down by a factor 3^(1/2) (square root of 3). I am considering your cube is represented in an isometric projection. To rotate each pixel you …

oh duh me … I’m thinking about taking that cube and finding the polygon that encloses the side taking an image an transforming it to fit those sides is affine transforms the top one would be a rotation of 45 degrees or so and another rotation away from the screen some 30 degrees or so since they…

Well, I played around with this today by writing some Xojo code that can transform pictures using a matrix and hit the same problem as Dave. [Screen Shot 2020-09-10 at 17.14.58] It seems that a rotate by itself is not good enough for the top and you will in fact need to perform a perspective tran…

In OpenGL, this is called texture mapping. Maybe search google for an open-source function of mapping a texture to a triangle?

You can concatenate transforms or apply multiple transforms. So now you’ve done the rotation, you could scale the vertical axis.

If Not Nil

Map an image to a polygon

Other

DaveS 18 September 2020 17:14 24

Solved

Isometeric Dice - an Xojo Program

For a Swift app I’m writing I needed renditions of a standard 6 sided dice show in all 24 possible combinations. Here is a program that will create these from scratch… create a folder, drop this app in and run it… This is provided AS-IS, NO SUPPORT, USE FOR YOUR OWN APPS etc… etc www.rdsisemore.com/make_dice.xojo_xml_project.zip [dice3A]

dice2B

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