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Fix how stroke is scaled for perspective

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Grant Sanderson 2021-01-09 10:30:11 -08:00
parent ac4755459a
commit a429a146c7
1 changed files with 2 additions and 1 deletions
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manimlib/shaders/quadratic_bezier_stroke/geom.glsl
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@ -216,7 +216,8 @@ void main() {
for(int i = 0; i < 3; i++){ for(int i = 0; i < 3; i++){
float sf = perspective_scale_factor(controls[i].z, focal_distance); float sf = perspective_scale_factor(controls[i].z, focal_distance);
if(bool(flat_stroke)){ if(bool(flat_stroke)){
sf *= abs(dot(v_global_unit_normal[i], vec3(0.0, 0.0, 1.0))); vec3 to_cam = normalize(vec3(0.0, 0.0, focal_distance) - controls[i]);
sf *= abs(dot(v_global_unit_normal[i], to_cam));
} }
scaled_strokes[i] = v_stroke_width[i] * sf; scaled_strokes[i] = v_stroke_width[i] * sf;
} }