I just study directx9 for a few months by myself,and i've been puzzled by a problem that is how to set texture for a sphere for a long time.i want to create an real earth like that of nasa world wind.In fact,i have create an earth,but some coordinate of the texture is wrong,i guess i have used a wrong formula. I hope you could help me! Thank you !
well,i use directx9.0 and language is c#(2003).
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How are you drawing the sphere; are you generating the vertices and texture coordinates manually? What is the projection method of the world texture you're using? A projection like this is easy to map: ( http://arstechnica.com/reviews/4q00/macosx-pb1/images/earth-map-huge.jpg ), there are other projection types though.. Some of them are easy, …
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