A raytrace framework using taichi language

蕉太狼

Last update: Dec 11, 2022

Related tags

Text Data & NLP ti-raytrace

Overview

ti-raytrace

The code use Taichi programming language

Current implement acceleration

lvbh
disney brdf

How to run

First config your anaconda workspace, and open the anaconda prompt
Second you need install taichi language, pip install taichi
Last you type ti Render.py, that's all

Some image produced by this project

metal

glass

non metal

Performance

100000 triangle mesh get 30fps with 2070super

Other algorithm:

radix sort
morton 3d code generation
compact & downweep

Reference

Nvidia 2012: Maximizing Parallelism in the Construction of BVHs,Octrees, and k-d Trees
Lauterbach 2009:Fast BVH Construction on GPUs

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Comments

A mistake in range determination.

` ############algrithm############## @ti.func def determineRange(self, idx): l_r_range = ti.cast(ti.Vector([0, self.primitive_count-1]), ti.i32)

    if idx != 0:
        self_code = self.morton_code_s[idx][0]
        l         = idx-1
        r         = idx+1
        l_code    = self.morton_code_s[l][0]
        r_code    = self.morton_code_s[r][0]

        if  (l_code == self_code ) & (r_code == self_code) :
            l_r_range[0] = idx

            while  idx < self.primitive_count-1:
                idx += 1
                
                if(idx >= self.primitive_count-1):
                    break

                if (self.morton_code_s[idx][0] != self.morton_code_s[idx+1][0]):
                    break
            l_r_range[1] = idx 
        else:
            L_delta   = UF.common_upper_bits(self_code, l_code)
            R_delta   = UF.common_upper_bits(self_code, r_code)

            d = -1
            if R_delta > L_delta:
                d = 1
            delta_min = min(L_delta, R_delta)
            l_max = 2
            delta = -1
            i_tmp = idx + d * l_max

            if ( (0 <= i_tmp) &(i_tmp < self.primitive_count)):
                delta = UF.common_upper_bits(self_code, self.morton_code_s[i_tmp][0])


            while delta > delta_min:
                l_max <<= 1
                i_tmp = idx + d * l_max
                delta = -1
                if ( (0 <= i_tmp) & (i_tmp < self.primitive_count)):
                    delta = UF.common_upper_bits(self_code, self.morton_code_s[i_tmp][0])

            l = 0
            t = l_max >> 1

            while(t > 0):
                i_tmp = idx + (l + t) * d
                delta = -1
                if ( (0 <= i_tmp) & (i_tmp < self.primitive_count)):
                    delta = UF.common_upper_bits(self_code, self.morton_code_s[i_tmp][0])
                if(delta > delta_min):
                    l += t
                t >>= 1

            l_r_range[0] = idx
            l_r_range[1] = idx + l * d
            if(d < 0):
                tmp          = l_r_range[0]
                l_r_range[0] = l_r_range[1]
                l_r_range[1] = tmp 

    return l_r_range`

In this code, I find delta may be equal to delta_min at the end of 'while delta > delta_min:'. Therefore, at last, l_r_range[1] = l_r_range[0]'. This is a mistake?

opened by lidan233 2

A raytrace framework using taichi language

Related tags

Overview

ti-raytrace

Current implement acceleration

How to run

Some image produced by this project

Performance

Other algorithm:

Reference

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Comments

A mistake in range determination.

Owner

蕉太狼

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