How to create a line that has two arrows in Cesium?

[Mickael]

hi,

I tried to create a custom shader, but the render is black, can you help me ?

Custom shader render black color

Hi, I would like to know why my custom shader is rendered in black color ? sand castle example // shader script used to display double segments // the line with arrows is slightly translated from the center axis // This is especially used in SegmentLoad Mode #ifdef GL_OES_standard_derivatives #extension GL_OES_standard_derivatives : enable #endif in float v_polylineAngle; uniform vec4 color; uniform vec4 dashGapColor; uniform float dashPattern; uniform float dashLength; vec4 color1 = vec4( …

thank you,