shield shader uses tickstart too

game/modules/tome/data/gfx/shaders/shield.frag

 uniform sampler2D tex;
 uniform float tick;
+uniform float tick_start;
 uniform float aadjust;
 uniform vec3 color;
 uniform float time_factor;
@@ -68,8 +69,8 @@ void main(void)
 	vec2 sphericalProjectedCoord = vec2(0.5, 0.5) + radius * (alpha / (3.141592 / 2.0)) / radiusLen;
 	
 	//two scrolling textures
-	vec4 c1 = texture2D(tex, (sphericalProjectedCoord + vec2(horizontalScrollingSpeed * tick / time_factor, 0.0)));
-	vec4 c2 = texture2D(tex, (sphericalProjectedCoord + vec2(0.0, verticalScrollingSpeed * tick / time_factor)));
+	vec4 c1 = texture2D(tex, (sphericalProjectedCoord + vec2(horizontalScrollingSpeed * (tick - tick_start) / time_factor, 0.0)));
+	vec4 c2 = texture2D(tex, (sphericalProjectedCoord + vec2(0.0, verticalScrollingSpeed * (tick - tick_start) / time_factor)));
 	vec4 c = c1 * c2;
 
 	//exponential thin layer absorbtion under angle alpha

game/modules/tome/data/gfx/shaders/shield.lua

@@ -40,5 +40,8 @@ return {
 		horizontalScrollingSpeed = horizontalScrollingSpeed or 1.0,
 		verticalScrollingSpeed = verticalScrollingSpeed or 0.3,
 	},
+	resetargs = {
+		tick_start = function() return core.game.getFrameTime() end,
+	},
 	clone = false,
 }