Can we adjust the position in Three.js to start at the top/left of the scene, similar to DOM elements?
I want to create a sphere so that when the position is 0,0,0, it will be at the top left corner, with its size specified in CSS pixel dimensions that do not change when the viewport size changes. If the size is 10, I want it to span 10 CSS pixels on the screen (at Z=0).
UPDATE: I am reposting this question on the official Three.js forums:
It is essential to configure the appropriate orthographic projection matrix instead of a perspective one to align with the canvas size in pixels. The orthographic projection matrix is structured as follows:
S 0 0 0 | S = 2 / right - left
0 T 0 0 | T = 2 / top - bottom
0 0 U 0 | U = -2 / far-near
Tx Ty Tz 1 |
To establish the projection matrix accurately and match the world space with screen space in pixels, you can use the following formula (assuming a 4x4 matrix defined in a 16 floats array):
view[ 0] = 2.0 / (canvasWidth);
view[ 5] = 2.0 / -(canvasHeight); // Negate to invert Y coordinates
view[10] = -2.0 / farClip - nearClip;
view[12] = -1.0; // Translate X so left border starts at 0
view[13] = 1.0; // Translate Y so top border starts at 0
view[14] = 0.0;
view[15] = 1.0;
You must now figure out how to implement this in Three.js...
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