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Questions tagged [point-sprites]

28 questions
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Point sprite rendering issues with three.js

I'm currently working an a project which will visualize data on browser by rendering excessive amounts of animated stroked circles. I started evaluating 3D libraries and ended up trying to create a proof of concept application with three.js. It is…
user1937459
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Point Sprite Alpha Blending

I'm working on a paint app for Android that allows users to draw using their finger. It's built using OpenGL ES 2.0 using point sprite technique as well as an FBO for quick rendering. I am having an issue blending the individual point sprites…
Georgi
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Point sprite alpha blending issue (Android / OpenGL ES 2.0)

I've recently started looking into OpenGL ES for Android and am working on a drawing app. I've implemented some basics such as point sprites, path smoothing and FBO for double buffering. At the moment I am playing around with the glBlendFunc, more…
Georgi
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how to specify point sprite texture coordinates in OpenGL ES 1.1?

I'm writing a particle system that uses point sprites in OpenGL ES 1.1 on iOS. Everything works great until I try to texture the point sprites... when I render, each sprite is colored by the top left pixel of the texture I'm loading (rather than…
joshue
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gl_PointCoord compiles and links, but crashes at runtime

I successfully wrote a standard basic transform feedback particle system with point-sprites. No flickering, the particles update from one buffer into the next, which is then rendered, then output buffer becomes input buffer on next iteration. All…
Frankoguy
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Oculus Rift + Point Sprites + Point size attenuation

I am coding a small project with Oculus Rfit support, and i use point sprites to render my particles. I calculate the size of the point sprites in pixels, based on their distance from the "camera" in the vertex shader. When drawing on the default…
GordathGfx
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Android OpenGL ES point sprite texture image was up-down inverted

I draw texture images using glDrawArrays(GL_POINTS, 0, PARTICLE_NUMBER) in android, then rend it to screen. In some phones the image was up-down inverted. Seems that there is no command GL_POINT_SPRITE_COORD_ORIGIN in OpenGL ES. Is there any other…
ding.wang
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DirectX 9 point sprites not scaling

I got point sprites working almost immediately, but I'm only stuck on one thing, they are rendered as probably 2x2 pixel sprites, which is not really very easy to see, especially if there's other motion. Now, I've tried tweaking all the variables,…
user3079666
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Render different OpenGL point sprite at each vertex

Basic question: with OpenGL, can a shader program be made to use a single glDrawArrays call (with GL_POINTS) to draw a different point sprite at each vertex? More info: I have an OpenGL desktop program (using SharpGL in a WPF application) that can…
FTLPhysicsGuy
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Why won't this simple OpenGL ES 2.0/SDL 2 program let me change my point sprite size?

I was working on a simple OpenGL ES 2.0 program (along with SDL 2 to make things a bit easier) and decided to try out point sprites. I was able to get them to draw successfully, but I wasn't able to change their size by outputting gl_PointSize from…
fouric
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Using point sprites with direct x. what steps need to be taken?

This is still an outstanding issue. I am trying to get a point sprites system workign render a sun in my world. I noticed another user asking a similar question (with the same code, presumably from my class :) ) but they were not able to complete…
Mark
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OpenGL equivalent to GL_POINT_SIZE_ARRAY_OES?

I'm trying to draw point sprites in a small Mac app. I want each sprite to have its own size, and I know that OpenGL ES has the client state "GL_POINT_SIZE_ARRAY_OES". I did some googling and discovered that there is a similar value…
Parker Kemp
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Render a vectorfield with Point Sprites in OpenGL

I'd like to render a vectorfield visualization with OpenGL. Right now, I have a 3D cube filled with points which I need to replace with arrows. I've read a lot about Point Sprites in OpenGL and they seem to fit my needs pretty good. I haven't really…
Schnigges
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