Cinder-OpticalFlow

This cinder block is based on the openFrameworks addon ofxMIOFlowGLSL

The sample project uses the optical flow texture generated by the input camera device to displace particles laid out on a grid. Lines are drawn to show the directions of the particles from their initial positions.

Notes

• A few chages where made to the shader files referenced from ofxMIOFlowGLSL to flip coordinate system and offset values.
• The sample project was built using Visual Studio platform toolset v142 and Windows sdk 10.0.18362.0
• The optical flow texture is used as a sampler2D uniform in the compute shader and the velocity is read via the following function.

// returns optical flow velocity based on parfticle position
vec2 lookupOpticalFlowVelocity(vec2 pos) {
	vec2 coord = (pos.xy / uCanvasSize);
	coord.y = 1.0 - coord.y; 
	vec4 col = texture2D(uTexOpticalFlow, coord);
	if (col.w >0.95)  col.z=col.z*-1;
	return vec2(-1*(col.y-col.x),col.z);
}

To Do

• make MacOSx sample.